San Antonio Intl climate by month
Averages and records for each calendar month at San Antonio Intl, United States, from 1946 to 2026. The warmest month is August, averaging 35.5°C; the coolest is January at 17.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 17.0°C | 4.5°C | 31.7°C30 January 1971 | −17.8°C31 January 1949 | 80 / 80 |
| February | 19.4°C | 6.6°C | 37.8°C21 February 1996 | −14.4°C2 February 1951 | 80 / 80 |
| March | 23.4°C | 10.6°C | 37.8°C28 March 1971 | −7.2°C2 March 1980 | 80 / 80 |
| April | 27.1°C | 14.9°C | 38.3°C19 April 1996 | −0.6°C3 April 1987 | 80 / 80 |
| May | 30.4°C | 19.2°C | 40.0°C31 May 2004 | 5.6°C4 May 2013 | 80 / 80 |
| June | 33.6°C | 22.6°C | 42.2°C29 June 2013 | 11.7°C2 June 1964 | 80 / 80 |
| July | 35.1°C | 23.8°C | 41.7°C13 July 2020 | 16.7°C16 July 1967 | 80 / 80 |
| August | 35.5°C | 23.7°C | 43.3°C28 August 2011 | 16.1°C25 August 1966 | 80 / 80 |
| September | 32.5°C | 20.9°C | 43.9°C5 September 2000 | 7.8°C19 September 1981 | 80 / 81 |
| October | 28.0°C | 15.6°C | 37.2°C12 October 1991 | −2.8°C31 October 1993 | 80 / 80 |
| November | 22.1°C | 9.7°C | 34.4°C4 November 1988 | −6.1°C29 November 1976 | 80 / 80 |
| December | 18.3°C | 5.8°C | 32.2°C25 December 1955 | −14.4°C23 December 1989 | 80 / 80 |
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 80 to 80 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.