The list · Lisbon Coast
Best beaches near Lisbon by train and busCascais line, Caparica, Ericeira
Which Lisbon-area beach to pick for calm water with kids, surf lessons or the quickest trip without a car: Cascais line train times, buses to Costa da Caparica and Ericeira, 2026 lifeguard seasons and Blue Flags, and why the Atlantic is colder.

Checked on 10 October 2026. Lifeguard dates and Blue Flags are for the 2026 season. We have not been to every beach on this page for this guide.
The short answer
Every beach near Lisbon is on the Atlantic, so expect cooler water and real waves on the open coast. Which one depends on what you need:
- Easy by train, usually calmer water for small children: Santo Amaro de Oeiras, 23 minutes from Cais do Sodré, the first Blue Flag 2026 beach on the line [3][2].
- Surf lessons by train: Carcavelos, 27 minutes, Blue Flag 2026, surf schools all year [3][2][13].
- A beach day plus a town: Tamariz in Estoril (36 min) or the Cascais town beaches (40 min) [3].
- The big sandy coast: Costa da Caparica, ten Blue Flag beaches, by bus or ferry plus bus [2][15].
- Surf town for a few days: Ericeira, a World Surfing Reserve, by bus from Campo Grande [18][19].
Lifeguards in 2026: from 1 May in Cascais, from 1 June in Oeiras and Almada, from 30 May in Sintra and from 13 June in Mafra; every official season had ended by 30 September [1]. Swim during the posted hours, when lifeguards are actually there.
The beaches at a glance
| Beach | How (from central Lisbon) | Sand / water | Blue Flag 2026 | Lifeguards 2026 | Small kids | Surf |
|---|---|---|---|---|---|---|
| Santo Amaro (Oeiras) | Train, 23 min + short walk | Long sand, gentle slope, inside the Tagus mouth | Yes | 1 Jun–30 Sep | Good | No |
| Carcavelos | Train, 27 min + walk | Long sand, surf waves | Yes | 1 May–30 Sep | OK, crowded | Yes, lessons |
| Parede | Train, 29 min | Rocky | Yes | 1 May–30 Sep | Not for bathing | No |
| São Pedro do Estoril | Train, 32 min | Not checked | Yes | 1 May–30 Sep | Not checked | Not checked |
| Tamariz (Estoril) | Train, 36 min, station at the beach | Town beach by the station | No | 1 May–30 Sep | OK | No |
| Conceição / Duquesa (Cascais) | Train, 40 min + few min walk | Sand, usually sheltered | No | 1 May–30 Sep | Good | No |
| Guincho | Train to Cascais + bus 405/415 | Wild, wind, strong currents | Yes | 1 May–30 Sep | No | Experienced, wind/kite |
| Costa da Caparica town beaches | Bus 3710 or ferry + bus | Open Atlantic, little sand at high tide | Yes | 1 Jun–30 Sep | OK | Yes, schools |
| Mata / Rainha (Caparica) | Bus to Costa, then bus 3044 on weekdays | Open Atlantic, wide | Yes | 1 Jun–30 Sep | OK | Yes |
| Ericeira: Pescadores | Bus, 44–81 min by line | Small harbour beach, calmest in town | No | 13 Jun–13 Sep | Good | No |
| Ericeira: Foz do Lizandro | Bus + local transfer | River mouth and sea | Yes | 13 Jun–13 Sep | OK | Yes |
| Ericeira: Ribeira d’Ilhas | Bus + transfer, a few km north | Surf competition break | Yes | 13 Jun–13 Sep | No | Experienced |
| Adraga (Sintra) | Car in practice | Cove under cliffs, limited-use beach | Yes | 30 May–13 Sep | Only with care | No |
Times: CP weekday daytime timetable [3]. Blue Flags [2]; lifeguard seasons [1]. Sand and water from the official profiles and the linked place pages [6][7][10][11][12][14][17][20]. “Not checked” means we did not find a source we trust.
Atlantic, not Mediterranean: what that changes
- Colder water. Modelled averages off Cascais peak at about 19.6–19.9 °C in August and September and drop to about 15 °C in February [9]. Off Málaga the August average is 23.4 °C [21]. If you are used to the Mediterranean, the first dip is a shock.
- Waves and currents. The open-coast beaches (Carcavelos, Guincho, Caparica, Ericeira) get Atlantic swell. Inside the Tagus mouth (Santo Amaro) and on sheltered town and harbour beaches (Conceição, Pescadores) the water is usually calmer, but calm is not guaranteed on any of them.
- Tides. Some beaches lose much of their sand at high tide, the Caparica town beaches in particular [14]. Check the tide before you pick a spot with small children.
- Stricter flags than Spain. In Portugal a yellow flag means swimming is prohibited; ask the lifeguard what else is allowed. Red: do not enter the water. Chequered: the beach is temporarily without lifeguards [5]. Stay inside the zone the lifeguards watch. Flags and currents: Is Lisbon safe?.
The Cascais line: beaches by train
The Cascais line runs from Cais do Sodré along the river and the sea. On a weekday daytime there is a train every 20 minutes, every 15 at rush hour [3]. A Zapping validation on the Navegante card covers the trip; see getting around Lisbon for fares. Work at Oeiras station brings a new timetable from 8 November 2026, so check the station times above for your date.
Caxias and Paço de Arcos come first and are official bathing beaches, without a 2026 Blue Flag [1][2]. Santo Amaro de Oeiras is the first Blue Flag one: a long, gently sloping sand beach with the Oeiras promenade behind it and full beach facilities [7]. We have not checked how the sea floor shelves. Blue Flag 2026, lifeguards 1 June–30 September, and amphibious chairs for assisted bathing [7][8]. One stop on, by Praia da Torre, the Oeiras ocean pool has a shallow children’s pool in summer.
Carcavelos is the big one: long sand, medium surf waves, surf schools working all year, and very busy on summer weekends [10][13]. Good for a surf lesson, less good for a toddler who wants flat water. More in Carcavelos.
Parede is on the 2026 Blue Flag list but is rocky and described as not favourable to bathing [2][12]. Families from Parede usually go to Carcavelos.
Tamariz in Estoril has its own station: you step off the train and cross to the beach [6]. It is not on the 2026 Blue Flag list [2]. APA rates the risk of short-term pollution as low, possible after heavy rain, and recorded no days advised against for that reason in 2025 [6].
Conceição and Duquesa are Cascais’s town beaches, a few minutes’ walk from the last station, and usually more sheltered than the open coast [10]. Sheltered is not the same as safe: follow the flags. Neither is on ABAE’s 2026 Blue Flag list [2].
Guincho is 5 km beyond Cascais by bus 405 or 415 [10]. It is a wind and surf beach with strong currents. Wikipedia calls it not suitable for swimming, particularly for people with young children [11]. Go to watch the kitesurfers, not to swim with children.
Evenings in 2026: works between Caxias and Cascais mean replacement buses instead of trains on weekday evenings from 21:50, on Saturdays from 20:50 and on Sundays early morning and from 19:50. They do not take wheelchairs, bikes or scooters [4]. Plan the trip back from the beach before then if you have a buggy.
Costa da Caparica: the long sandy coast
Across the river, Costa da Caparica is one long sandy coast with ten Blue Flag beaches in 2026 [2]. It is open Atlantic with surf schools along most of it [14].
- Getting there: direct bus 3710 from Areeiro, 45–60 minutes [15], or the ferry from Cais do Sodré to Cacilhas (single €2.00) plus bus 3011 or 3022, about 40–45 minutes on the bus [22][23]. The operator warns of significant delays on 3710 for about ten months from April 2026 because of tunnel works [16]. Details in Costa da Caparica.
- Town beaches (CDS and neighbours) are walkable from the bus terminal but lose a lot of sand at high tide [14].
- For families, the town hall points to Praia da Mata and Praia da Rainha, both lifeguarded in season and Blue Flag 2026 [14][2]. They are still surf beaches. From Costa town, bus 3044 runs to Praia da Mata in about 15 minutes, 12 times on a weekday and not at weekends [24].
- Fonte da Telha at the south end is wilder and not on the 2026 Blue Flag list [2].
Lifeguards in Almada: 1 June to 30 September 2026 [1].
Ericeira: the surf town
Ericeira, north-west of Lisbon, has been a World Surfing Reserve since 2011 [19]. Carris Metropolitana buses 2740, 2801 and 2803 run from Campo Grande; about 44 minutes on the 2801, which runs mostly on weekdays (3 runs a day each way on the sample weekend), 56 to 69 minutes on the 2803 via Mafra and 68 to 81 minutes on the 2740, depending on direction [18][25]. It is better for a few days than for a day trip. See Ericeira and surfing in Ericeira.
- Praia dos Pescadores: the small harbour beach in the centre, described as the calmest water in town [17]. Not on the 2026 Blue Flag list [2].
- Praia do Sul: town beach with beginner-friendly waves [17].
- Foz do Lizandro: the river mouth south of town; Blue Flag 2026 for the sea water [2][17].
- Ribeira d’Ilhas: the competition break. Watch from the top on big days [17].
Lifeguards in Mafra start late and end early: 13 June to 13 September 2026 [1].
Sintra’s coast: by car
The Sintra beaches (Adraga, Grande, Maçãs, Magoito, São Julião) are all Blue Flag 2026 and lifeguarded from 30 May to 13 September [2][1]. Adraga is a cove under cliffs with a restaurant; parking runs out in summer [20]. The 2026 Portaria lists it as a praia de uso limitado, a limited-use beach, without giving the reason [1]; keep clear of the cliff foot and any marked zones. We did not verify a practical bus to these beaches, so treat them as a car day.
With children
Our shortlist from the sources, not from experience: Santo Amaro de Oeiras for the easiest train trip and the gentle slope [7], Conceição and Duquesa in Cascais for sheltered water and a town around them [10], and Pescadores if you stay in Ericeira [17]. Avoid Guincho and Ribeira d’Ilhas with small children [11][17]. Whatever the beach:
- Swim only in the lifeguarded season, during the posted hours and inside the watched zone, and follow the flags [1][5].
- Watch the tide: the sand can shrink fast [14].
- For older children, Carcavelos Surf School teaches ages 6–11 [13].
More on days out in Lisbon with kids.
For surf
Beginners: Carcavelos (by train) or the Caparica beaches, with a school [10][14]. Ericeira for a surf week, with Praia do Sul for first waves and Ribeira d’Ilhas only for experienced surfers [17]. Guincho for wind and kite. Take a lesson rather than guessing the conditions.
What we’d do
For a first beach day from Lisbon with small children: the Cascais line to Santo Amaro, back before the evening replacement buses. With a beginner surfer in the family: Carcavelos with a booked lesson. For a full week by the sea: stay in Cascais or Ericeira rather than commuting; see where to stay on the Lisbon coast. Outside each town’s season, go for a walk, not a swim: you cannot count on lifeguards [1]. Trips that are not about the beach (Sintra, Évora, Óbidos): day trips from Lisbon.
Sources
- Portaria n.º 204-A/2026/1, anexo I: bathing seasons 2026, accessed 10 October 2026.
- ABAE: Bandeira Azul 2026 awardees, accessed 10 October 2026.
- CP: Linha de Cascais timetable PDF, accessed 10 October 2026; the file is headed “valid since 6 April 2026” and the station times were recounted from the CP GTFS feed on 26 October 2026.
- CP: Cascais line replacement bus service, page dated 21 September 2026, accessed 10 October 2026.
- AMN: Edital de Praia, flag meanings, accessed 10 October 2026.
- APA: bathing-water profile Tamariz, April 2026.
- APA: bathing-water profile Santo Amaro, 2026.
- Município de Oeiras: bathing season 2026, 2 June 2026.
- seatemperature.org: Cascais sea temperature, modelled, accessed 9 October 2026.
- cascais-portugal.com: Cascais beaches, 2026.
- Wikipedia: Guincho Beach, accessed 9 October 2026.
- Wikipedia (pt): Praia da Parede, accessed 9 October 2026.
- Carcavelos Surf School, operator, October 2026.
- Câmara Municipal de Almada: beaches, accessed 9 October 2026.
- Carris Metropolitana: line 3710 data, October 2026.
- Carris Metropolitana: service alerts, accessed 9 October 2026.
- Ericeira Portugal Tourism: Ericeira beaches, 2026.
- Carris Metropolitana: line 2740 Ericeira–Campo Grande, accessed 9 October 2026.
- Save The Waves: Ericeira World Surfing Reserve, accessed 9 October 2026.
- Wikipedia (pt): Praia da Adraga, accessed 9 October 2026.
- seatemperature.org: Málaga sea temperature, modelled, accessed 9 October 2026.
- TTSL: 2026 ferry fares, accessed 9 October 2026.
- Carris Metropolitana: line 3022 data, October 2026.
- Carris Metropolitana: line 3044 data, July and October 2026.
- Carris Metropolitana: GTFS feed, Ericeira lines 2740, 2801 and 2803, counted for 13, 17 and 18 October 2026, accessed 11 October 2026.
Source references
- Portaria n.º 204-A/2026/1, de 30 de abril, anexo I: bathing waters, bathing seasons 2026 and 'praias de banhos' where lifeguards are assured (Cascais 1 May–30 Sep; Oeiras and Almada 1 Jun–30 Sep; Sintra 30 May–13 Sep; Mafra 13 Jun–13 Sep) · accessed
- ABAE: Galardoados 2026 (Cascais 8 incl. marina: Avencas, Carcavelos, Crismina, Guincho Norte, Guincho Sul, Parede, S. Pedro do Estoril; Oeiras: Santo Amaro, Torre; Almada 10: CDS, Dragão Vermelho, Infante, Mata, Praia Nova, Rainha, S. João da Caparica, Santo António, Sereia, Tarquínio-Paraíso; Mafra: Algodio, Baleia, Foz do Lizandro-Mar, Ribeira de Ilhas, S. Lourenço; Sintra: Adraga, Grande, Maçãs, Magoito, S. Julião) · accessed
- CP: Linha de Cascais timetable PDF on cp.pt. NOTE, 14-day review 26 Oct 2026: the file at this URL is headed Horário em vigor desde 6 de abril 2026, not 28 Sep 2026 as this citation said; the station times below were recounted from the CP GTFS feed on 26 Oct 2026 and still hold. A new timetable applies from 8 Nov 2026 (Oeiras works) and CP had published no PDF for it. Original note: (weekday daytime: Cais do Sodré 10:40 → Santo Amaro 11:03, Carcavelos 11:07, Parede 11:09, São Pedro do Estoril 11:12, Estoril 11:16, Cascais 11:20; every 20 min) · accessed
- CP: Cascais line replacement bus service (page dated 21 Sep 2026): Caxias–Cascais works since 6 April; buses replace trains Mon–Fri from 21:50, Sat from 20:50, Sun 05:30–08:50 and from 19:50; no wheelchairs, bikes or scooters on replacement buses · accessed
- AMN: Edital de Praia, Continente e Madeira (flags: green bathing and swimming allowed; yellow careful, swimming prohibited; red danger, do not enter the water; chequered temporarily unguarded) · accessed
- APA: bathing-water profile Tamariz (PTCT9J), April 2026 (season 1 May–30 Sep 2026; station on site; low short-term pollution risk after heavy rain) · accessed
- APA: bathing-water profile Santo Amaro (PTCQ8P), Oeiras (season 1 Jun–30 Sep 2026; long sand with a gentle slope along the promenade; pollution possible after heavy rain via the Laje stream) · accessed
- Município de Oeiras: Época balnear arranca em Oeiras (2 Jun 2026): weekend and holiday cover since 2 April, 20 lifeguards, Torre and Santo Amaro Blue Flag, amphibious chairs at Santo Amaro · accessed
- seatemperature.org: Cascais monthly average sea temperature (modelled; Aug 19.6 °C, Sep 19.9, Oct 19.8, Feb 15.2) · accessed
- cascais-portugal.com: Cascais beaches 2026 (Conceição/Duquesa sheltered, a few minutes from the station; Carcavelos 'medium-sized waves suitable for surfing'; Guincho 'powerful currents', buses 405/415 from Cascais station) · accessed
- Wikipedia (en): Guincho Beach (strong summer north winds; not suitable for swimming, particularly for people with young children) · accessed
- Wikipedia (pt): Praia da Parede (rocky, 'not favourable to bathing') · accessed
- Carcavelos Surf School: kids' lessons ages 6–11, group lessons from €41.95 (Oct 2026) · accessed
- Câmara Municipal de Almada: praias a visitar (Mata and Rainha as family beaches with lifeguards in season; town beaches lose sand at high tide) · accessed
- Carris Metropolitana API v2: pattern 3710 Areeiro–Costa da Caparica (trips and run times, 13 and 17 Oct 2026) · accessed
- Carris Metropolitana API v2: alerts (3710 significant delays, Av. João XXI tunnel works, about 10 months from April 2026) · accessed
- ericeiraportugaltourism.com: Ericeira beaches 2026 (Pescadores sheltered, calmest; Sul beginner waves; Foz do Lizandro river mouth; Ribeira d'Ilhas competition break) · accessed
- Carris Metropolitana: line 2740 Ericeira (Terminal) - Lisboa (C. Grande) via A8 (also 2801, 2803) · accessed
- Save The Waves: Ericeira World Surfing Reserve (dedicated 2011) · accessed
- Wikipedia (pt): Praia da Adraga (cove under cliffs, restaurant and toilets, parking insufficient in summer) · accessed
- seatemperature.org: Málaga monthly average sea temperatures (Aug 23.4 °C), for the Atlantic vs Mediterranean comparison · accessed
- TTSL: Tarifário 2026 (Cacilhas–Cais do Sodré ferry single €2.00 from 15 May 2026) · accessed
- Carris Metropolitana API v2: patterns 3011 and 3022 Cacilhas–Costa da Caparica (run times, October 2026) · accessed
- Carris Metropolitana API v2: pattern 3044 Costa da Caparica–Praia da Mata (15 min, 12 weekday trips, none on Saturdays and Sundays, July and October 2026) · accessed
- Carris Metropolitana / TML: GTFS feed (version 20261009), Campo Grande–Ericeira counted for Tue 13, Sat 17 and Sun 18 Oct 2026, all patterns: 2801 44 min (23 runs towards Ericeira on Tuesday, 3 on Saturday and on Sunday); 2803 via Mafra 56–59 min out, 64–69 min back (23 / 7 / 6 runs); 2740 via A8 68–71 min out, 74–81 min back (22 / 15 / 9 runs) · accessed
The places in this guide
| # | Place | With kids | Last checked | Map |
|---|---|---|---|---|
| 01 | Praia de Santo Amaro de Oeiras | Fine | 2026-10-10 | Open |
| 02 | Praia de Carcavelos | Fine | 2026-10-09 | Open |
| 03 | Praia do Tamariz | Fine | 2026-10-10 | Open |
| 04 | Praia da Conceição and Praia da Duquesa | Great | 2026-10-14 | Open |
| 05 | Praia do Guincho | Hard | 2026-10-09 | Open |
| 06 | Praia de São João da Caparica | Fine | 2026-10-14 | Open |
| 07 | Praia do CDS | Fine | 2026-10-14 | Open |
| 08 | Praia da Mata | Fine | 2026-10-09 | Open |
| 09 | Praia da Rainha (Costa da Caparica) | Fine | 2026-10-14 | Open |
| 10 | Praia da Fonte da Telha | Fine | 2026-10-09 | Open |
| 11 | Praia dos Pescadores | Great | 2026-10-09 | Open |
| 12 | Praia do Sul | Fine | 2026-10-14 | Open |
| 13 | Foz do Lizandro | Great | 2026-10-14 | Open |
| 14 | Praia de Ribeira d'Ilhas | Fine | 2026-10-14 | Open |
| 15 | Praia da Adraga | Fine | 2026-10-14 | Open |
Further afield: Praia da Rainha (Costa da Caparica) (12 km), Praia de Santo Amaro de Oeiras (15 km), Praia da Fonte da Telha (16 km), Praia de Carcavelos (18 km), Praia do Tamariz (23 km), Praia da Conceição and Praia da Duquesa (24 km), Praia do Guincho (29 km), Praia da Adraga (32 km), Foz do Lizandro (36 km), Praia do Sul (37 km), Praia dos Pescadores (38 km), Praia de Ribeira d'Ilhas (40 km). Straight-line distances from the centre point, not driving times.
Schematic: positions from each place's coordinates, no roads or coastline. Not for navigation.
Beach
Praia de Santo Amaro de Oeiras
Long, gently sloping town beach five minutes from Santo Amaro station; Blue Flag 2026, lifeguards 1 June–30 September 2026. The first Blue Flag beach on the Cascais line (research).
Researchedlast checked
Beach
Praia de Carcavelos
Long Blue Flag 2026 beach on the Cascais train line, the Lisbon area's go-to for beginner and intermediate surf; very busy on summer weekends.
Researchedlast checked
Beach
Praia do Tamariz
Estoril beach right below the train station, 36 minutes from Cais do Sodré; lifeguards 1 May–30 September 2026; not on the 2026 Blue Flag list (research).
Researchedlast checked
Beach
Praia da Conceição and Praia da Duquesa
Two joined town beaches near Cascais station. Often sheltered, but conditions vary; follow lifeguard flags. Convenient for families, busy in summer.
Researchedlast checked
Beach
Praia do Guincho
Wild 800 m Atlantic beach 5 km from Cascais in the Sintra-Cascais Natural Park: great for surf, wind- and kitesurf, and for watching; not a swimming beach for small children.
Researchedlast checked
Beach
Praia de São João da Caparica
The northern end of the Caparica coast: 1.4 km of sand between groynes, beach clubs, surf and SUP; Blue Flag 2026. Paid parking.
Researchedlast checked
Beach
Praia do CDS
Town-front beach on the Costa da Caparica promenade, named after a surf club; Blue Flag 2026; the sand shrinks a lot at high tide.
Researchedlast checked
Beach
Praia da Mata
Wide family beach south of Costa da Caparica town, popular with holiday camps; Blue Flag 2026; weekday bus 3044 from town.
Researchedlast checked
Beach
Praia da Rainha (Costa da Caparica)
Family beach south of Costa da Caparica with lifeguards in season and an amphibious beach wheelchair; Blue Flag 2026; paid parking.
Researchedlast checked
Beach
Praia da Fonte da Telha
Almost 3 km of sand at a fishing village under the Arriba Fóssil cliffs; lifeguarded sections in season, not Blue Flag 2026; one road in, jammed in summer.
Researchedlast checked
Beach
Praia dos Pescadores
Small harbour beach in the centre of Ericeira, sheltered from the wind: described as the calmest water in town, with lifeguards in season. The one for toddlers.
Researchedlast checked
Beach
Praia do Sul
Ericeira's town beach on the south side: lifeguards, beginner-friendly surf and usually the most crowded sand in town; listed by ABAE as Baleia (Praia do Sul) for the 2026 Blue Flag.
Researchedlast checked
Beach
Foz do Lizandro
Sea beach at the Lizandro river mouth south of Ericeira: surf, lifeguards in season, restaurant, step-free access listed and a Blue Flag 2026 for the sea bathing water.
Researchedlast checked
Beach
Praia de Ribeira d'Ilhas
Ericeira's main surf beach and the World Surfing Reserve's competition break, a few kilometres north of town; Blue Flag 2026. Watch from the top on big days; lessons and lifeguards in season.
Researchedlast checked
Beach
Praia da Adraga
A cove below Atlantic cliffs near Almoçageme; the municipality lists a restaurant and toilets. Awarded a Blue Flag for the 2026 bathing season, which has ended.
Researchedlast checked
Quick answers
What is the closest beach to Lisbon by train?
On the Cascais line from Cais do Sodré, Caxias (about 17 minutes) and Paço de Arcos (about 19) are the first official bathing beaches; Santo Amaro de Oeiras, at about 23 minutes, is the first with a 2026 Blue Flag (CP timetable PDF on cp.pt, station times recounted from the CP GTFS feed on 26 October 2026; Portaria 204-A/2026/1; ABAE). Carcavelos is 27 minutes, Estoril (Tamariz) 36 and Cascais 40. There are no bathing beaches inside the city of Lisbon itself.
Which Lisbon beach is best for small children?
The sheltered ones inside the Tagus mouth or in harbours: Santo Amaro de Oeiras (long sand with a gentle slope, Blue Flag 2026), the Cascais town beaches Conceição and Duquesa, and Praia dos Pescadores in Ericeira. They are still Atlantic beaches, so stay in the lifeguarded zone and follow the flags. Skip Guincho with small children: strong wind and currents.
When are Lisbon beaches lifeguarded in 2026?
It depends on the town. By the 2026 Portaria: Cascais 1 May–30 September, Oeiras and Almada (Costa da Caparica) 1 June–30 September, Sintra 30 May–13 September, Mafra (Ericeira) 13 June–13 September. Outside those dates, do not count on lifeguards.
Can you swim in the sea in Lisbon in October?
Many people do, but the water is cold for most: modelled averages off Cascais are about 20 °C in September and October and 15–16 °C in winter. In 2026 every official bathing season had ended by 30 September, so you cannot count on lifeguards in October.
What do the beach flags mean in Portugal?
Green: bathing and swimming allowed. Yellow: careful, swimming is prohibited. Red: danger, do not enter the water. Chequered: the beach is temporarily without lifeguards (Maritime Authority beach notice). Yellow in Portugal is stricter than in Spain, where it means swim with caution.
Can you get to Costa da Caparica or Ericeira without a car?
Yes. Costa da Caparica: direct bus 3710 from Areeiro (45–60 minutes) or the ferry to Cacilhas plus bus 3011 or 3022. Ericeira: Carris Metropolitana buses 2740, 2801 and 2803 from Campo Grande, about 45 minutes to over an hour. Check carrismetropolitana.pt for times: bus 3710 has works delays in 2026.