Galveston weather in August 2025

Expect daytime maximum temperatures of 31°C in Galveston in August and very high heat and humidity based on long-term weather averages. There are 9 hours of sunshine per day on average with typically 110 mm of rainfall in the month.

  • 31°C maximum daytime temperature in August in Galveston31
    31°C max day temperature
  • 9 hours of sunshine per day
  • 9 days with some rainfall in August in Galveston9
    9 days with some rainfall
  • 26°C minimum night-time temperature in August in Galveston26
    26°C min night temperature
  • 13 hours of daylight per day in August in Galveston13
    13 hours of daylight per day
  • Very high heat & humidity in August in GalvestonVH
    Very High heat & humidity
  • 110 mm monthly rainfall in August in Galveston110
    110 mm of monthly rainfall
  • UV (maximum) index 10 (Very High) in August in Galveston10
    10 (Very High) UV index
  • 30°C sea temperature in August in Galveston30
    30°C sea temperature

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The August weather guide for Texas (Galveston) 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 Galveston in August?

Daytime temperatures usually reach 31°C in Galveston in August with very high heat and humidity, falling to 26°C at night.

How sunny is it in Galveston in August?

There are normally 9 hours of bright sunshine each day in Galveston in August - that's 68% of daylight hours.

How warm is the sea around Galveston in August?

The average sea temperature around Galveston in August is 30°C.

Does it rain in Galveston in August?

There are usually 9 days with some rain in Galveston in August and the average monthly rainfall is 110mm.

What is the chance of a hurricane in Galveston in August?

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

Galveston August sunrise & sunset times

Browse the sunrise and sunset times for Galveston in August 2025. Select a month to view Galveston sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:40 19:11
Saturday, 16th August 2025 05:48 18:58
Sunday, 31st August 2025 05:56 18:42

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