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St Croix weather in September 2025
Expect daytime maximum temperatures of 31°C in St Croix 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 18 days with some rainfall and typically 137 mm of rainfall in the month.
- 31°C max day temperature
31
- 8 hours of sunshine per day
- 18 days with some rainfall
18
- 24°C min night temperature
24
- 12 hours of daylight per day
12
- Very High heat & humidity
VH
- 137 mm of monthly rainfall
137
- 11+ (Extreme) UV index
11
- 29°C sea temperature
29
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The September weather guide for Virgin Islands (St Croix) 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 Croix in September?
Daytime temperatures usually reach 31°C in St Croix in September with very high heat and humidity, falling to 24°C at night.
How sunny is it in St Croix in September?
There are normally 8 hours of bright sunshine each day in St Croix in September - that's 64% of daylight hours.
How warm is the sea around St Croix in September?
The average sea temperature around St Croix in September is 29°C.
Does it rain in St Croix in September?
There are usually 18 days with some rain in St Croix in September and the average monthly rainfall is 137mm.
What is the chance of a hurricane in St Croix in September?
On average 1.1 days in September in St Croix are likely to be affected by the passage of one or more tropical storms.
St Croix September sunrise & sunset times
Browse the sunrise and sunset times for St Croix in September 2025. Select a month to view St Croix sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 06:05 | 18:32 |
Monday, 15th September 2025 | 06:07 | 18:21 |
Tuesday, 30th September 2025 | 06:09 | 18:08 |
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