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.

  • 18°C maximum daytime temperature in September in St Helena18
    18°C max day temperature
  • 12 days with some rainfall in September in St Helena12
    12 days with some rainfall
  • 15°C minimum night-time temperature in September in St Helena15
    15°C min night temperature
  • 12 hours of daylight per day in September in St Helena12
    12 hours of daylight per day
  • No heat & humidity in September in St Helena0
    No heat & humidity
  • 54 mm monthly rainfall in September in St Helena54
    54 mm of monthly rainfall
  • UV (maximum) index 11 (Extreme) in September in St Helena11
    11 (Extreme) UV index
  • 20°C sea temperature in September in St Helena20
    20°C sea temperature

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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)

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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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