St Helena weather in August 2025

Expect 17°C daytime maximum temperatures in the shade with on average -9999 hours of sunshine per day in St Helena in August. Check more long-term weather averages for St Helena in August before you book your next holiday to St Helena & Islands in 2025/2026.

  • 17°C maximum daytime temperature in August in St Helena17
    17°C max day temperature
  • 15 days with some rainfall in August in St Helena15
    15 days with some rainfall
  • 14°C minimum night-time temperature in August in St Helena14
    14°C min night temperature
  • 12 hours of daylight per day in August in St Helena12
    12 hours of daylight per day
  • No heat & humidity in August in St Helena0
    No heat & humidity
  • 68 mm monthly rainfall in August in St Helena68
    68 mm of monthly rainfall
  • UV (maximum) index 9 (Very High) in August in St Helena9
    9 (Very High) UV index
  • 21°C sea temperature in August in St Helena21
    21°C sea temperature

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The August 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 warm is it in St Helena in August?

Daytime temperatures usually reach 17°C in St Helena in August, falling to 14°C at night.

How warm is the sea around St Helena in August?

The average sea temperature around St Helena in August is 21°C.

Does it ever rain in St Helena in August?

There are usually 15 days with some rain in St Helena in August and the average monthly rainfall is 68mm.

St Helena August sunrise & sunset times

Browse the sunrise and sunset times for St Helena in August 2025. Select a month to view St Helena sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 06:47 18:12
Saturday, 16th August 2025 06:39 18:15
Sunday, 31st August 2025 06:29 18:17

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