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The weather in San Antonio in May is hot. The average temperatures are between 20°C and 31°C.
You can expect about 3 to 8 days of rain in San Antonio during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in San Antonio in May 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 |