St Thomas weather in September 2025

Expect 31°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in St Thomas in September. Check more long-term weather averages for St Thomas in September before you book your next holiday to Virgin Islands in 2025/2026.

  • 31°C maximum daytime temperature in September in St Thomas31
    31°C max day temperature
  • 8 hours of sunshine per day
  • 16 days with some rainfall in September in St Thomas16
    16 days with some rainfall
  • 24°C minimum night-time temperature in September in St Thomas24
    24°C min night temperature
  • 12 hours of daylight per day in September in St Thomas12
    12 hours of daylight per day
  • High heat & humidity in September in St ThomasH
    High heat & humidity
  • 143 mm monthly rainfall in September in St Thomas143
    143 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in St Thomas11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in St Thomas29
    29°C sea temperature

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The September weather guide for Virgin Islands (St Thomas) 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 St Thomas in September?

Daytime temperatures usually reach 31°C in St Thomas in September with high heat and humidity, falling to 24°C at night.

How sunny is it in St Thomas in September?

There are normally 8 hours of bright sunshine each day in St Thomas in September - that's 63% of daylight hours.

How warm is the sea around St Thomas in September?

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

Does it rain in St Thomas in September?

There are usually 16 days with some rain in St Thomas in September and the average monthly rainfall is 143mm.

What is the chance of a hurricane in St Thomas in September?

On average 1.1 days in September in St Thomas are likely to be affected by the passage of one or more tropical storms.

St Thomas September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:05 18:34
Monday, 15th September 2025 06:08 18:22
Tuesday, 30th September 2025 06:10 18:09

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