San Antonio weather in September 2025

Q: How hot is it in San Antonio in September?

Daytime temperatures usually reach 32°C in San Antonio in September with high heat and humidity, falling to 21°C at night.

Q: 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.

Q: 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 90mm.

Q: What is the chance of a cyclone 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.

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
90°F max day temperature
8
8 hours of sunshine per day
7
7 days with some rainfall
70
70°F min night temperature
12
12 hours of daylight per day
H
High heat & humidity
3.5
3.5 inches of monthly rainfall
10
10 (Very High) UV index

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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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Texas - quick facts
Flight time^✝	10 hours
Time difference	UK -6 to -7 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Tourist info	Texas Economic Development & Tourism Division