Sagres weather by monthIPMA normals 1991–2020, sea temperature and a comparison with Lagos

About the data

• Sagres table: IPMA climate normals 1991–2020 for station 533, Sagres / Quartel da Marinha (37.0128N, 8.9489W, 22.9 m), PDF version 1.0 of 2024 [1]
• IPMA describes the series as hybrid: observed data (classic and automatic stations) plus data modelled with WRF at local scale; values may change with ongoing quality control [1]
• The PDF covers temperature and precipitation only – no sunshine hours, no wind, no humidity – so those columns are absent here [1]
• “High” / “Low” = mean of the daily maximum / minimum air temperature; “Rain days” = days with precipitation ≥ 1 mm; “Days ≥ 25 °C” = days whose maximum reaches 25 °C (IPMA: “dias de verão”) [1]
• Sea: NOAA OISST v2.1 offshore surface temperatures, 2001–2020, calculated and checked on 11 October 2026 (Sagres 36.875° N, 9.125° W [5]). We average daily values within each month and year, then give each of the 20 annual monthly means equal weight. These 0.25° grid cells are coastal proxies, not measurements at individual beaches or a forecast.
• Normals are 30-year averages, not a forecast; a 0.2 in the rain-days column is a monthly average rounded, not a promise [1]

Sagres weather by month (IPMA normals 1991–2020, station 533)

Month	High °C	Low °C	Mean °C	Rain mm	Rain days ≥ 1 mm	Days ≥ 25 °C	Sea °C
January	16.1	8.5	12.3	53.3	7.4	0.0	16.4
February	16.3	8.8	12.6	48.5	6.3	0.0	15.7
March	17.8	10.6	14.2	48.8	6.3	0.2	15.7
April	19.1	12.0	15.5	34.7	5.7	0.5	16.3
May	21.5	13.9	17.7	22.1	3.9	3.5	17.4
June	23.9	16.2	20.0	3.7	0.7	8.4	18.9
July	25.2	17.0	21.1	1.0	0.2	12.0	19.5
August	25.9	17.4	21.7	1.5	0.4	16.0	19.9
September	24.9	16.7	20.8	18.5	2.5	12.6	20.6
October	22.4	15.0	18.7	61.4	6.7	3.9	20.3
November	19.0	11.7	15.3	82.0	8.4	0.0	18.8
December	17.0	9.9	13.5	75.2	8.0	0.0	17.5
Year	20.8	13.1	17.0	450.5	56.6	57.2	–

• High, Low, Mean, Rain mm, Rain days and Days ≥ 25 °C: IPMA normals 1991–2020, station 533 [1]
• Sea °C: monthly offshore averages, not minimum or maximum temperatures. [5]
• Hot days ≥ 30 °C per year: 8.5 (May 0.2, Jun 1.3, Jul 2.6, Aug 3.2, Sep 1.2, Oct 0.1); days ≥ 35 °C: 0.6 per year [1]
• Tropical nights (minimum ≥ 20 °C): 5.8 per year, all between May and November, August highest at 1.9 [1]
• Frost days (minimum < 0 °C): 0.1 per year [1]
• Days with ≥ 10 mm of rain: 13.8 per year, most in November and December (2.6 each) [1]
• Record high in the period: 40.4 °C on 4 August 2018; record low: −2.0 °C on 28–29 January 2005; wettest day: 85.9 mm on 21 November 2005 [1]
• Individual coves and daily conditions can differ from the offshore monthly average.

Sagres vs Lagos

Month	High °C Sagres	High °C Lagos	Low °C Sagres	Low °C Lagos	Rain days Sagres (≥ 1 mm)	Rainy days Lagos (threshold unstated)	Sea °C Sagres	Sea °C Lagos
January	16.1	14.9	8.5	8.5	7.4	6	16.4	16.3
February	16.3	15.4	8.8	8.8	6.3	5	15.7	15.5
March	17.8	17.2	10.6	10.4	6.3	5	15.7	15.5
April	19.1	18.9	12.0	11.9	5.7	5	16.3	16.3
May	21.5	22.1	13.9	14.0	3.9	4	17.4	17.4
June	23.9	25.5	16.2	16.6	0.7	1	18.9	19.0
July	25.2	27.3	17.0	17.6	0.2	0	19.5	19.5
August	25.9	28.1	17.4	18.3	0.4	0	19.9	20.0
September	24.9	25.9	16.7	17.4	2.5	2	20.6	20.6
October	22.4	22.3	15.0	15.4	6.7	6	20.3	20.3
November	19.0	17.8	11.7	11.5	8.4	6	18.8	18.7
December	17.0	15.8	9.9	9.7	8.0	7	17.5	17.4

• Air uses two different datasets: Sagres = IPMA station normals 1991–2020 (station 533) [1]; Lagos = climate-data.org modelled data, temperatures and rain 1991–2021, no weather station – copied from the Lagos weather guide (PR #2), not re-fetched [4]
• Rainy-day counts are not comparable: IPMA counts days ≥ 1 mm [1]; climate-data.org does not state its threshold [4]
• Annual rain: Sagres 450.5 mm [1]; Lagos about 475 mm in the modelled dataset [4]
• Monthly rain, Sagres vs Lagos (mm): Nov 82.0 vs 68, Dec 75.2 vs 87, Jan 53.3 vs 59, Oct 61.4 vs 64, Jul 1.0 vs 0 [1][4]
• Derived from the two tables above (arithmetic on [1] and [4], not a source of its own): Sagres mean daily high is lower than Lagos’s from May to September (Jul −2.1 °C, Aug −2.2 °C, Jun −1.6 °C) and higher from November to March (Jan +1.2 °C, Dec +1.2 °C); mean lows differ by ≤ 0.9 °C in every month [1][4]
• Sea: NOAA OISST v2.1 offshore surface temperatures, 2001–2020, calculated and checked on 11 October 2026 (Sagres 36.875° N, 9.125° W [5]; Lagos 36.875° N, 8.625° W [6]). We average daily values within each month and year, then give each of the 20 annual monthly means equal weight. These 0.25° grid cells are coastal proxies, not measurements at individual beaches or a forecast.

The whole coast from Faro’s official normals: Algarve weather by month.

Best months for Sagres

Sources

1. IPMA: Normal Climatológica 1991–2020, Sagres / Quartel da Marinha, station 533 (PDF): mean daily maximum, minimum and mean temperature; days ≥ 25 / 30 / 35 °C, tropical nights, frost days; precipitation and days ≥ 1 / 10 / 20 / 30 mm; extremes with dates. Version 1.0 of 2024, hybrid series. Accessed 2 October 2026.
2. NOAA OISST v2.1: dataset description, accessed 11 October 2026.
3. NOAA OISST v2.1: dataset description, accessed 11 October 2026.
4. climate-data.org: Lagos, Portugal: modelled climate table (temperatures and rain 1991–2021) (air and rain only here), as copied from the Lagos weather guide (PR #2), which accessed it on 1 October 2026. Not re-fetched for this page.
5. NOAA OISST v2.1 Final: daily offshore SST, sagres (36.875 N, 9.125 W), 2001–2020; monthly means calculated from 20 annual monthly means, accessed 11 October 2026.
6. NOAA OISST v2.1 Final: daily offshore SST, lagos (36.875 N, 8.625 W), 2001–2020; monthly means calculated from 20 annual monthly means, accessed 11 October 2026.