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Get the San Antonio TX weather forecast without ads, cookies, or tracking. Open-Meteo data, 10-day forecast, hourly conditions, and radar — all free. click here to hide this
August is the hottest month in San Antonio TX, with an average high of 97°F / 36°C; January is the coldest (65°F / 18°C). May is the wettest month, averaging 1.1 in / 29 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 65 / 18 | 43 / 6 | 0.5 / 12 | 1 |
| Feb | 69 / 20 | 47 / 8 | 0.2 / 6 | 1 |
| Mar | 75 / 24 | 55 / 13 | 0.4 / 9 | 1 |
| Apr | 82 / 28 | 61 / 16 | 0.7 / 17 | 1 |
| May | 88 / 31 | 68 / 20 | 1.1 / 29 | 2 |
| Jun | 93 / 34 | 74 / 23 | 0.6 / 16 | 2 |
| Jul | 95 / 35 | 75 / 24 | 1.0 / 25 | 1 |
| Aug | 97 / 36 | 76 / 24 | 0.2 / 5 | 1 |
| Sep | 91 / 33 | 71 / 22 | 0.6 / 15 | 1 |
| Oct | 83 / 29 | 62 / 17 | 0.6 / 16 | 1 |
| Nov | 74 / 23 | 52 / 11 | 0.3 / 8 | 1 |
| Dec | 66 / 19 | 44 / 7 | 0.2 / 4 | 1 |
Extremes since 1999: highest 111°F / 44°C (August 28, 2011), lowest 10°F / -12°C (February 15, 2021).
Daylight lasts about 13.9 hours in June and 10.1 hours in December.
Data: Meteostat — San Antonio / Bergs Mill, 1991–2020 averages.
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