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St Helena weather in September 2025
Expect 18°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in St Helena in September. Check more long-term weather averages for St Helena in September before you book your next holiday to St Helena & Islands in 2025/2026.
- 1818°C max day temperature
- 1212 days with some rainfall
- 1515°C min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 5454 mm of monthly rainfall
- 1111 (Extreme) UV index
- 2020°C sea temperature
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Recommended for St Helena & Islands
The September weather guide for St Helena & Islands (St Helena) 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 Helena in September?
Daytime temperatures usually reach 18°C in St Helena in September, falling to 15°C at night.
How warm is the sea around St Helena in September?
The average sea temperature around St Helena in September is 20°C.
Does it ever rain in St Helena in September?
There are usually 12 days with some rain in St Helena in September and the average monthly rainfall is 54mm.
St Helena September sunrise & sunset times
Browse the sunrise and sunset times for St Helena in September 2025. Select a month to view St Helena sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 06:29 | 18:17 |
Monday, 15th September 2025 | 06:18 | 18:18 |
Tuesday, 30th September 2025 | 06:06 | 18:20 |
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