San Antonio
September
Weather in San Antonio for September 2025
Your guide to San Antonio weather in September - trends and predictions
In general, the average temperature in San Antonio at the beginning of September is 36.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 35.4 °F by the end of September.
With an average of 4 rainy days, San Antonio experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
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26
Dry days
4
Rainy days
0
Snow days
38°/24°
Temperatures
21 km/h
Avg max wind
55 %
Avg humidity
San Antonio in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  37° | 2 36° | 3  35° | 4  35° | 5  37° | 6 37° | 7  37° |
| 8 37° | 9 37° | 10 37° | 11 36° | 12 35° | 13 34° | 14 37° |
| 15  35° | 16  36° | 17 38° | 18 36° | 19 36° | 20 38° | 21 35° |
| 22 37° | 23 37° | 24 37° | 25 34° | 26 34° | 27 35° | 28 37° |
| 29 35° | 30 36° |
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Temperatures trend during September in San Antonio
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Partly cloudy | 37° /25° | 0.1 mm | 9 | |
| Sept. 2 | Partly cloudy | 36° /23° | 1.1 mm | 9 | |
| Sept. 3 | Sunny | 35° /23° | 10.9 mm | 8 | |
| Sept. 4 | Overcast | 35° /22° | 0.8 mm | 8 | |
| Sept. 5 | Cloudy | 37° /23° | 0 mm | 9 | |
| Sept. 6 | Overcast | 37° /24° | 0 mm | 9 | |
| Sept. 7 | Mist | 37° /23° | 0 mm | 9 | |
| Sept. 8 | Sunny | 37° /22° | 0 mm | 9 | |
| Sept. 9 | Partly cloudy | 37° /21° | 0 mm | 9 | |
| Sept. 10 | Sunny | 37° /22° | 0.6 mm | 9 | |
| Sept. 11 | Overcast | 36° /23° | 0 mm | 8 | |
| Sept. 12 | Overcast | 35° /23° | 0 mm | 8 | |
| Sept. 13 | Overcast | 34° /24° | 0 mm | 8 | |
| Sept. 14 | Overcast | 37° /23° | 0 mm | 8 | |
| Sept. 15 | Thundery outbreaks possible | 35° /24° | 0 mm | 8 | |
| Sept. 16 | Light rain shower | 36° /21° | 5.1 mm | 8 | |
| Sept. 17 | Patchy rain possible | 38° /23° | 0.1 mm | 9 | |
| Sept. 18 | Partly cloudy | 36° /24° | 0 mm | 9 | |
| Sept. 19 | Overcast | 36° /24° | 0 mm | 8 | |
| Sept. 20 | Partly cloudy | 38° /23° | 0 mm | 9 | |
| Sept. 21 | Cloudy | 35° /23° | 0 mm | 8 | |
| Sept. 22 | Patchy rain possible | 37° /23° | 0 mm | 8 | |
| Sept. 23 | Thundery outbreaks possible | 37° /24° | 0 mm | 8 | |
| Sept. 24 | Thundery outbreaks possible | 37° /24° | 2.3 mm | 8 | |
| Sept. 25 | Overcast | 34° /23° | 9.1 mm | 8 | |
| Sept. 26 | Cloudy | 34° /22° | 0 mm | 8 | |
| Sept. 27 | Overcast | 35° /21° | 0 mm | 9 | |
| Sept. 28 | Partly cloudy | 37° /22° | 0 mm | 9 | |
| Sept. 29 | Overcast | 35° /21° | 0 mm | 8 | |
| Sept. 30 | Light rain shower | 36° /21° | 0.3 mm | 8 | |
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Important Notice
Our weather forecast for San Antonio in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the San Antonio forecast closer to your planned date for the most up-to-date weather information.
San Antonio in September - FAQ
What are the expected maximum and minimum temperatures in San Antonio during September?
With daytime temperatures soaring above 38° and not dropping much below 24° at night, September in San Antonio is quite hot. Staying hydrated and avoiding peak sun hours is advisable.
How much rainfall should be expected in San Antonio during September?
Expect minimal rainfall in San Antonio during September, with a total of 15.7 mm over approximately 4 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in San Antonio during September?
The average wind speed in San Antonio during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in San Antonio
Explore the daily rainfall trends and prepare for San Antonios September weather 💧
UV exposure in San Antonio during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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