St Barthelemy weather in September 2025

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

  • 31°C maximum daytime temperature in September in St Barthelemy31
    31°C max day temperature
  • 8 hours of sunshine per day
  • 19 days with some rainfall in September in St Barthelemy19
    19 days with some rainfall
  • 25°C minimum night-time temperature in September in St Barthelemy25
    25°C min night temperature
  • 12 hours of daylight per day in September in St Barthelemy12
    12 hours of daylight per day
  • Very high heat & humidity in September in St BarthelemyVH
    Very High heat & humidity
  • 129 mm monthly rainfall in September in St Barthelemy129
    129 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in St Barthelemy11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in St Barthelemy29
    29°C sea temperature

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The September weather guide for St Barthelemy 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 Barthelemy in September?

Daytime temperatures usually reach 31°C in St Barthelemy in September with very high heat and humidity, falling to 25°C at night.

How sunny is it in St Barthelemy in September?

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

How warm is the sea around St Barthelemy in September?

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

Does it rain in St Barthelemy in September?

There are usually 19 days with some rain in St Barthelemy in September and the average monthly rainfall is 129mm.

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

On average 1.2 days in September in St Barthelemy are likely to be affected by the passage of one or more tropical storms.

St Barthelemy September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:57 18:25
Monday, 15th September 2025 05:59 18:13
Tuesday, 30th September 2025 06:02 18:01

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