San Antonio Weather in September
What's the weather like in San Antonio (Heredia) in September 2024?
The climate in San Antonio during September can be summarized as warm, humid and very wet.
September is in the fall / autumn in San Antonio and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a muggy 27°C (80°F), whilst at night 19°C (67°F) is normal.
| Daytime temperature | 26.5°C 79.6°F |
|---|---|
| Nightly temperature | 19.4°C 66.8°F |
| Average temperature | 22.9°C 73.2°F |
| Daily sunshine | 5.9 hrs |
| Avg rainfall | 332 mm 13.1 ins |
| Rainy days | 23 days |
| Sea temperature | 28.6°C 83.5°F |
| Humidity | 86% |
| Windspeed | 10.1kph 6 mph |
On average September is the wettest month of the year in San Antonio with around 332mm 13.1 inches of rain making it a very wet time to visit. This rainfall is typically spread over 23 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.9 hours of sunshine per day.
September temperatures in San Antonio
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Antonio in September 2024.
Other monthly averages
Best places to visit in September
San Antonio weather stats
| Hottest month: | April | 28.6°C 83.5°F |
|---|---|---|
| Driest month: | January | 0mm 0ins |
| Sunniest month: | February | 8.9hrs |
| Coldest month: | October | 26.2°C 79.2°F |
| Wettest month: | September | 332mm 13.1ins |
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