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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.
- 3030°C max day temperature
- 8 hours of sunshine per day
- 1010 days with some rainfall
- 2424°C min night temperature
- 1212 hours of daylight per day
- HHigh heat & humidity
- 138138 mm of monthly rainfall
- 99 (Very High) UV index
- 2929°C sea temperature
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Recommended for Texas
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)
More about the USA
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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