San Antonio weather in August 2025

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

Daytime temperatures usually reach 35°C in San Antonio in August with very high heat and humidity, falling to 23°C at night.

Q: How sunny is it in San Antonio in August?

There are normally 9 hours of bright sunshine each day in San Antonio in August - that's 71% of daylight hours.

Q: Does it rain in San Antonio in August?

There are usually 5 days with some rain in San Antonio in August and the average monthly rainfall is 55mm.

Q: What is the chance of a cyclone in San Antonio in August?

On average less than 1 day in August in San Antonio is likely to be affected by the passage of one or more tropical storms.

Expect 35°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in San Antonio in August. Check more long-term weather averages for San Antonio in August before you book your next holiday to Texas in 2025/2026.

35
35°C max day temperature
9
9 hours of sunshine per day
5
5 days with some rainfall
23
23°C min night temperature
13
13 hours of daylight per day
VH
Very High heat & humidity
55
55 mm of monthly rainfall
11
11 (Extreme) UV index

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The August 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 / mm) | Imperial (°F / inches)

More about the USA

How hot is it in San Antonio in August?

Daytime temperatures usually reach 35°C in San Antonio in August with very high heat and humidity, falling to 23°C at night.

How sunny is it in San Antonio in August?

There are normally 9 hours of bright sunshine each day in San Antonio in August - that's 71% of daylight hours.

Does it rain in San Antonio in August?

There are usually 5 days with some rain in San Antonio in August and the average monthly rainfall is 55mm.

What is the chance of a hurricane in San Antonio in August?

On average less than 1 day in August in San Antonio is likely to be affected by the passage of one or more tropical storms.

San Antonio August sunrise & sunset times

Browse the sunrise and sunset times for San Antonio in August 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
Friday, 1st August 2025	05:54	19:26
Saturday, 16th August 2025	06:03	19:13
Sunday, 31st August 2025	06:11	18:57

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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