- San Antonio ›
- Weather by month
San Antonio Weather by Month
Average temperatures, rainfall and humidity for San Antonio, United States, month by month, built from OpenWeather's historical records. Use it to see what a typical San Antonio month looks like before you travel — then check the live San Antonio forecast for the days ahead.
Warmest month
August
36°C average high
Coolest month
January
6°C average low
Wettest month
May
118 mm of rain
Driest month
February
25 mm of rain
Average temperature and rainfall in San Antonio by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 18°C | 6°C | -8°C / 31°C | 39 mm | 64% | 12 km/h |
| February | 21°C | 9°C | -13°C / 34°C | 25 mm | 66% | 13 km/h |
| March | 25°C | 13°C | -3°C / 36°C | 39 mm | 64% | 15 km/h |
| April | 28°C | 16°C | 2°C / 36°C | 57 mm | 67% | 16 km/h |
| May | 31°C | 20°C | 7°C / 40°C | 118 mm | 70% | 16 km/h |
| June | 34°C | 24°C | 17°C / 41°C | 56 mm | 70% | 15 km/h |
| July | 36°C | 24°C | 16°C / 42°C | 32 mm | 65% | 14 km/h |
| August | 36°C | 24°C | 19°C / 42°C | 30 mm | 63% | 13 km/h |
| September | 33°C | 22°C | 9°C / 40°C | 79 mm | 66% | 12 km/h |
| October | 29°C | 17°C | 1°C / 37°C | 68 mm | 65% | 12 km/h |
| November | 23°C | 12°C | -3°C / 33°C | 47 mm | 69% | 12 km/h |
| December | 20°C | 9°C | -9°C / 31°C | 44 mm | 69% | 11 km/h |
Best time to visit San Antonio
The most comfortable time to visit San Antonio is generally February to March and November, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 635 mm a year.
Travellers who prefer heat should aim for August, when highs average 36°C. May is the month to avoid if rain would spoil your plans — it averages 118 mm, roughly 5× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the San Antonio forecast for what is happening now.