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St Martin weather in September 2025
Expect daytime maximum temperatures of 31°C in St Martin in September and very high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 19 days with some rainfall and typically 129 mm of rainfall in the month.
- 31°C max day temperature
31 - 8 hours of sunshine per day
- 19 days with some rainfall
19 - 25°C min night temperature
25 - 12 hours of daylight per day
12 - Very High heat & humidity
VH - 129 mm of monthly rainfall
129 - 11+ (Extreme) UV index
11 - 29°C sea temperature
29
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The September weather guide for St Martin 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)
How hot is it in St Martin in September?
Daytime temperatures usually reach 31°C in St Martin in September with very high heat and humidity, falling to 25°C at night.
How sunny is it in St Martin in September?
There are normally 8 hours of bright sunshine each day in St Martin in September - that's 63% of daylight hours.
How warm is the sea around St Martin in September?
The average sea temperature around St Martin in September is 29°C.
Does it rain in St Martin in September?
There are usually 19 days with some rain in St Martin in September and the average monthly rainfall is 129mm.
What is the chance of a hurricane in St Martin in September?
On average 1.2 days in September in St Martin are likely to be affected by the passage of one or more tropical storms.
St Martin September sunrise & sunset times
Browse the sunrise and sunset times for St Martin in September 2025. Select a month to view St Martin sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Monday, 1st September 2025 | 05:58 | 18:26 |
| Monday, 15th September 2025 | 06:00 | 18:14 |
| Tuesday, 30th September 2025 | 06:03 | 18:01 |
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