Guernsey weather in August 2025

Expect 20°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Guernsey in August. Check more long-term weather averages for Guernsey in August before you book your next holiday to Guernsey in 2025/2026.

  • 20°C maximum daytime temperature in August in Guernsey (St Peter Port)20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 11 days with some rainfall in August in Guernsey (St Peter Port)11
    11 days with some rainfall
  • 14°C minimum night-time temperature in August in Guernsey (St Peter Port)14
    14°C min night temperature
  • 14 hours of daylight per day in August in Guernsey (St Peter Port)14
    14 hours of daylight per day
  • No heat & humidity in August in Guernsey (St Peter Port)0
    No heat & humidity
  • 45 mm monthly rainfall in August in Guernsey (St Peter Port)45
    45 mm of monthly rainfall
  • UV (maximum) index 6 (High) in August in Guernsey (St Peter Port)6
    6 (High) UV index
  • 17°C sea temperature in August in Guernsey (St Peter Port)17
    17°C sea temperature

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The August weather guide for Guernsey, represented by St Peter Port, (St Peter Port) 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 Guernsey in August?

Daytime temperatures usually reach 20°C in St Peter Port, Guernsey in August, falling to 14°C at night.

How sunny is it in Guernsey in August?

There are normally 7 hours of bright sunshine each day in St Peter Port, Guernsey in August - that's 52% of daylight hours.

How warm is the sea around Guernsey in August?

The average sea temperature around St Peter Port, Guernsey in August is 17°C.

Does it rain in Guernsey in August?

There are usually 11 days with some rain in St Peter Port, Guernsey in August and the average monthly rainfall is 45mm.

Guernsey August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:42 19:50
Saturday, 16th August 2025 05:03 19:25
Sunday, 31st August 2025 05:25 18:55

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