Guernsey weather in September 2021

  • 18°C maximum daytime temperature in September in Guernsey (St Peter Port)18
    18°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Guernsey (St Peter Port)13
    13 days with some rainfall
  • 13°C minimum night-time temperature in September in Guernsey (St Peter Port)13
    13°C min night temperature
  • 13 hours of daylight per day in September in Guernsey (St Peter Port)13
    13 hours of daylight per day
  • No heat & humidity in September in Guernsey (St Peter Port)0
    No heat & humidity
  • 63 mm monthly rainfall in September in Guernsey (St Peter Port)63
    63 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Guernsey (St Peter Port)4
    4 (Moderate) UV index
  • 17°C sea temperature in September in Guernsey (St Peter Port)17
    17°C sea temperature

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The September weather guide for Guernsey 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.

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How hot is it in Guernsey in September?

Daytime temperatures usually reach 18°C in St Peter Port, Guernsey in September, falling to 13°C at night.

How sunny is it in Guernsey in September?

There are normally 6 hours of bright sunshine each day in St Peter Port, Guernsey in September - that's 45% of daylight hours.

How warm is the sea around Guernsey in September?

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

Does it rain in Guernsey in September?

There are usually 13 days with some rain in St Peter Port, Guernsey in September and the average monthly rainfall is 63mm.

Metric (°C / mm)  |  Imperial (°F / inches)

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Guernsey sunrise & sunset times for September 2021

Browse the sunrise & sunset times for Guernsey in September 2021. Select a month to view Guernsey sunrise & sunset times for the next twelve months. The Guernsey sunrise & sunset times shown below are for St Peter Port.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st September 2021 06:26 19:53
Wednesday, 15th September 2021 06:47 19:23
Thursday, 30th September 2021 07:09 18:51
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