San Antonio/Stinson Muni weather by month
Averages and records for each calendar month at San Antonio/Stinson Muni, United States, from 1998 to 2026. The warmest month is August, averaging 37.0°C; the coolest is January at 18.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 18.5°C | 5.4°C | 31.1°C2 January 2026 | −8.3°C9 January 2010 | 28 / 28 |
| February | 20.9°C | 7.9°C | 35.6°C26 February 2026 | −12.1°C15 February 2021 | 28 / 28 |
| March | 25.0°C | 12.2°C | 36.1°C14 March 2025 | −6.1°C4 March 2002 | 28 / 28 |
| April | 28.3°C | 16.0°C | 38.9°C13 April 2022 | 1.7°C8 April 2007 | 28 / 28 |
| May | 31.7°C | 20.0°C | 41.1°C7 May 2022 | 5.6°C4 May 2013 | 28 / 29 |
| June | 34.8°C | 23.3°C | 42.2°C15 June 1998 | 16.1°C12 June 2020 | 29 / 29 |
| July | 36.0°C | 23.9°C | 42.8°C23 July 2018 | 17.8°C30 July 2025 | 29 / 29 |
| August | 37.0°C | 24.2°C | 45.0°C28 August 2011 | 17.2°C13 August 2004 | 29 / 29 |
| September | 33.8°C | 21.7°C | 44.4°C5 September 2000 | 8.3°C30 September 2020 | 28 / 29 |
| October | 29.3°C | 16.6°C | 37.8°C10 October 2019 | 1.7°C29 October 2017 | 28 / 28 |
| November | 23.5°C | 11.0°C | 34.4°C5 November 2017 | −3.8°C14 November 2018 | 28 / 28 |
| December | 19.5°C | 6.7°C | 32.2°C3 December 2013 | −7.7°C23 December 2022 | 28 / 28 |
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 28 to 29 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.