Galveston weather in September 2025

Expect 30°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Galveston in September. Check more long-term weather averages for Galveston in September before you book your next holiday to Texas in 2025/2026.

  • 30°C maximum daytime temperature in September in Galveston30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in September in Galveston10
    10 days with some rainfall
  • 24°C minimum night-time temperature in September in Galveston24
    24°C min night temperature
  • 12 hours of daylight per day in September in Galveston12
    12 hours of daylight per day
  • High heat & humidity in September in GalvestonH
    High heat & humidity
  • 138 mm monthly rainfall in September in Galveston138
    138 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in September in Galveston9
    9 (Very High) UV index
  • 29°C sea temperature in September in Galveston29
    29°C sea temperature

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The September 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 September?

Daytime temperatures usually reach 30°C in Galveston in September with high heat and humidity, falling to 24°C at night.

How sunny is it in Galveston in September?

There are normally 8 hours of bright sunshine each day in Galveston in September - that's 64% of daylight hours.

How warm is the sea around Galveston in September?

The average sea temperature around Galveston in September is 29°C.

Does it rain in Galveston in September?

There are usually 10 days with some rain in Galveston in September and the average monthly rainfall is 138mm.

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

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

Galveston September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:57 18:41
Monday, 15th September 2025 06:04 18:24
Tuesday, 30th September 2025 06:12 18:06

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