San Sebastian Arpt climate by month
Averages and records for each calendar month at San Sebastian Arpt, Spain, from 1973 to 2026. The warmest month is August, averaging 26.0°C; the coolest is January at 12.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 12.8°C | 5.6°C | 25.1°C1 January 2022 | −8.5°C16 January 1985 | 24 / 51 |
| February | 14.4°C | 6.0°C | 27.6°C26 February 1994 | −6.3°C12 February 2012 | 23 / 51 |
| March | 16.1°C | 7.5°C | 31.1°C29 March 2023 | −2.8°C3 March 1988 | 36 / 51 |
| April | 17.8°C | 9.1°C | 32.7°C17 April 2013 | 0.0°C2 April 1974 | 41 / 52 |
| May | 20.7°C | 12.0°C | 36.6°C30 May 1996 | 0.0°C8 May 1977 | 41 / 52 |
| June | 23.4°C | 15.2°C | 39.8°C21 June 2003 | 6.4°C6 June 1984 | 43 / 52 |
| July | 25.2°C | 17.6°C | 41.7°C18 July 2022 | 11.0°C1 July 1975 | 44 / 52 |
| August | 26.0°C | 17.6°C | 41.9°C11 August 2024 | 8.0°C31 August 1974 | 41 / 51 |
| September | 24.2°C | 15.1°C | 37.4°C12 September 2016 | 5.0°C21 September 1977 | 39 / 49 |
| October | 21.9°C | 12.6°C | 33.9°C2 October 2023 | 0.7°C29 October 2012 | 27 / 51 |
| November | 16.7°C | 8.8°C | 29.8°C8 November 2015 | −4.8°C23 November 1988 | 22 / 50 |
| December | 14.3°C | 6.9°C | 24.8°C19 December 2015 | −7.2°C25 December 2001 | 23 / 50 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 22 to 44 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.