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The weather in San Antonio in August is very hot. The average temperatures are between 25°C and 36°C, drinking water regularly is advisable.
You can expect a few rainy days in San Antonio during August, but usually the weather is comfortable in August.
Our weather forecast can give you a great sense of what weather to expect in San Antonio in August 2025.
If you’re planning to visit San Antonio in the near future, we highly recommend that you review the 14 day weather forecast for San Antonio before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 17° / 8° | 2 | 29 | 0 | 38 mm | Good | San Antonio in January |
| February | 19° / 9° | 2 | 26 | 0 | 32 mm | Good | San Antonio in February |
| March | 23° / 13° | 3 | 28 | 0 | 46 mm | Perfect | San Antonio in March |
| April | 27° / 16° | 5 | 25 | 0 | 68 mm | Perfect | San Antonio in April |
| May | 31° / 20° | 7 | 24 | 0 | 115 mm | Ok | San Antonio in May |
| June | 34° / 23° | 5 | 25 | 0 | 90 mm | Ok | San Antonio in June |
| July | 35° / 24° | 4 | 27 | 0 | 69 mm | Ok | San Antonio in July |
| August | 36° / 25° | 2 | 29 | 0 | 54 mm | Ok | San Antonio in August |
| September | 32° / 23° | 7 | 23 | 0 | 142 mm | Ok | San Antonio in September |
| October | 28° / 18° | 3 | 28 | 0 | 58 mm | Perfect | San Antonio in October |
| November | 22° / 13° | 2 | 28 | 0 | 40 mm | Good | San Antonio in November |
| December | 18° / 9° | 3 | 28 | 0 | 42 mm | Good | San Antonio in December |