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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.

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Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
38°/24°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
55 %
Avg humidity

San Antonio in September average weather

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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
Partly cloudy
37° /25° 0.1 mm 9
Sept. 2 Partly cloudy
Partly cloudy
36° /23° 1.1 mm 9
Sept. 3 Sunny
Sunny
35° /23° 10.9 mm 8
Sept. 4 Overcast
Overcast
35° /22° 0.8 mm 8
Sept. 5 Cloudy
Cloudy
37° /23° 0 mm 9
Sept. 6 Overcast
Overcast
37° /24° 0 mm 9
Sept. 7 Mist
Mist
37° /23° 0 mm 9
Sept. 8 Sunny
Sunny
37° /22° 0 mm 9
Sept. 9 Partly cloudy
Partly cloudy
37° /21° 0 mm 9
Sept. 10 Sunny
Sunny
37° /22° 0.6 mm 9
Sept. 11 Overcast
Overcast
36° /23° 0 mm 8
Sept. 12 Overcast
Overcast
35° /23° 0 mm 8
Sept. 13 Overcast
Overcast
34° /24° 0 mm 8
Sept. 14 Overcast
Overcast
37° /23° 0 mm 8
Sept. 15 Thundery outbreaks possible
Thundery outbreaks possible
35° /24° 0 mm 8
Sept. 16 Light rain shower
Light rain shower
36° /21° 5.1 mm 8
Sept. 17 Patchy rain possible
Patchy rain possible
38° /23° 0.1 mm 9
Sept. 18 Partly cloudy
Partly cloudy
36° /24° 0 mm 9
Sept. 19 Overcast
Overcast
36° /24° 0 mm 8
Sept. 20 Partly cloudy
Partly cloudy
38° /23° 0 mm 9
Sept. 21 Cloudy
Cloudy
35° /23° 0 mm 8
Sept. 22 Patchy rain possible
Patchy rain possible
37° /23° 0 mm 8
Sept. 23 Thundery outbreaks possible
Thundery outbreaks possible
37° /24° 0 mm 8
Sept. 24 Thundery outbreaks possible
Thundery outbreaks possible
37° /24° 2.3 mm 8
Sept. 25 Overcast
Overcast
34° /23° 9.1 mm 8
Sept. 26 Cloudy
Cloudy
34° /22° 0 mm 8
Sept. 27 Overcast
Overcast
35° /21° 0 mm 9
Sept. 28 Partly cloudy
Partly cloudy
37° /22° 0 mm 9
Sept. 29 Overcast
Overcast
35° /21° 0 mm 8
Sept. 30 Light rain shower
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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Location coordinates Where is San Antonio?

Get accurate weather forecasts for San Antonio, located at latitude 29.424 and longitude -98.494. Stay updated with localized weather information tailored for San Antonio.

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