St Martin weather in September 2025

Q: 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.

Q: 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.

Q: How warm is the sea around St Martin in September?

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

Q: 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.

Q: 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.

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
31°C max day temperature
8
8 hours of sunshine per day
19
19 days with some rainfall
25
25°C min night temperature
12
12 hours of daylight per day
VH
Very High heat & humidity
129
129 mm of monthly rainfall
11
11+ (Extreme) UV index
29
29°C sea temperature

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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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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St Martin - quick facts
Time difference	UK -4 hours
Language(s)	French
Currency	Euro
Electricity	C + E plug (220V)
Driving side	Right
Why visit?	Beaches Nightlife
Tourist info	St Martin Tourism Office