San Antonio weather in August 2025

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°C maximum daytime temperature in August in San Antonio35
    35°C max day temperature
  • 9 hours of sunshine per day
  • 5 days with some rainfall in August in San Antonio5
    5 days with some rainfall
  • 23°C minimum night-time temperature in August in San Antonio23
    23°C min night temperature
  • 13 hours of daylight per day in August in San Antonio13
    13 hours of daylight per day
  • Very high heat & humidity in August in San AntonioVH
    Very High heat & humidity
  • 55 mm monthly rainfall in August in San Antonio55
    55 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in August in San Antonio11
    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)

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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.

JanFebMarAprMayJunJulAugSepOctNovDec

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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