Jersey weather in August 2025

Expect 20°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Jersey in August. Check more long-term weather averages for Jersey in August before you book your next holiday to Jersey in 2025/2026.

  • 20°C maximum daytime temperature in August in Jersey (St Helier)20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in August in Jersey (St Helier)11
    11 days with some rainfall
  • 14°C minimum night-time temperature in August in Jersey (St Helier)14
    14°C min night temperature
  • 14 hours of daylight per day in August in Jersey (St Helier)14
    14 hours of daylight per day
  • No heat & humidity in August in Jersey (St Helier)0
    No heat & humidity
  • 52 mm monthly rainfall in August in Jersey (St Helier)52
    52 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Jersey (St Helier)6
    6 (High) UV index
  • 18°C sea temperature in August in Jersey (St Helier)18
    18°C sea temperature

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The August weather guide for Jersey, represented by St Helier, (St Helier) 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 Jersey in August?

Daytime temperatures usually reach 20°C in St Helier, Jersey in August, falling to 14°C at night.

How sunny is it in Jersey in August?

There are normally 8 hours of bright sunshine each day in St Helier, Jersey in August - that's 52% of daylight hours.

How warm is the sea around Jersey in August?

The average sea temperature around St Helier, Jersey in August is 18°C.

Does it rain in Jersey in August?

There are usually 11 days with some rain in St Helier, Jersey in August and the average monthly rainfall is 52mm.

Jersey August sunrise & sunset times

Browse the sunrise and sunset times for Jersey in August 2025. Select a month to view Jersey sunrise and sunset times for the next 12 months. The Jersey sunrise and sunset times shown below are for St Helier.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:41 19:48
Saturday, 16th August 2025 05:02 19:22
Sunday, 31st August 2025 05:23 18:53

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