St Peter Port weather in September 2025

Expect daytime maximum temperatures of 18°C in St Peter Port, Guernsey in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 13 days with some rainfall and typically 63 mm of rainfall in the month.

  • 18°C maximum daytime temperature in September in St Peter Port18
    18°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in St Peter Port13
    13 days with some rainfall
  • 13°C minimum night-time temperature in September in St Peter Port13
    13°C min night temperature
  • 13 hours of daylight per day in September in St Peter Port13
    13 hours of daylight per day
  • No heat & humidity in September in St Peter Port0
    No heat & humidity
  • 63 mm monthly rainfall in September in St Peter Port63
    63 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in St Peter Port4
    4 (Moderate) UV index
  • 17°C sea temperature in September in St Peter Port17
    17°C sea temperature

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The September 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 St Peter Port in September?

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

How sunny is it in St Peter Port in September?

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

How warm is the sea around St Peter Port in September?

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

Does it rain in St Peter Port in September?

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

St Peter Port September sunrise & sunset times

Browse the sunrise and sunset times for St Peter Port in September 2025. Select a month to view St Peter Port sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 18:53
Monday, 15th September 2025 05:47 18:23
Tuesday, 30th September 2025 06:09 17:51

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