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San Antonio weather in September 2025
Expect 90°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in San Antonio in September. Check more long-term weather averages for San Antonio in September before you book your next holiday to Texas in 2025/2026.
- 90°F max day temperature
90 - 8 hours of sunshine per day
- 7 days with some rainfall
7 - 70°F min night temperature
70 - 12 hours of daylight per day
12 - High heat & humidity
H - 3.5 inches of monthly rainfall
3.5 - 10 (Very High) UV index
10
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Recommended for San Antonio
The September weather guide for Texas (San Antonio) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C) | Imperial (°F)
More about the USA
How hot is it in San Antonio in September?
Daytime temperatures usually reach 90°F in San Antonio in September with high heat and humidity, falling to 70°F at night.
How sunny is it in San Antonio in September?
There are normally 8 hours of bright sunshine each day in San Antonio in September - that's 63% of daylight hours.
Does it rain in San Antonio in September?
There are usually 7 days with some rain in San Antonio in September and the average monthly rainfall is 3.5 inches.
What is the chance of a hurricane in San Antonio in September?
On average less than 1 day in September in San Antonio is likely to be affected by the passage of one or more tropical storms.
San Antonio September sunrise & sunset times
Browse the sunrise and sunset times for San Antonio in September 2025. Select a month to view San Antonio sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 06:12 | 18:56 |
| Monday, 15th September 2025 | 06:19 | 18:39 |
| Tuesday, 30th September 2025 | 06:27 | 18:20 |
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