St Helier weather in September 2025

Expect daytime maximum temperatures of 19°C in St Helier, Jersey 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 75 mm of rainfall in the month.

  • 19°C maximum daytime temperature in September in St Helier19
    19°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in St Helier13
    13 days with some rainfall
  • 13°C minimum night-time temperature in September in St Helier13
    13°C min night temperature
  • 13 hours of daylight per day in September in St Helier13
    13 hours of daylight per day
  • No heat & humidity in September in St Helier0
    No heat & humidity
  • 75 mm monthly rainfall in September in St Helier75
    75 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in St Helier4
    4 (Moderate) UV index
  • 17°C sea temperature in September in St Helier17
    17°C sea temperature

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The September 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 St Helier in September?

Daytime temperatures usually reach 19°C in St Helier in September, falling to 13°C at night.

How sunny is it in St Helier in September?

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

How warm is the sea around St Helier in September?

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

Does it rain in St Helier in September?

There are usually 13 days with some rain in St Helier in September and the average monthly rainfall is 75mm.

St Helier September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:25 18:51
Monday, 15th September 2025 05:45 18:21
Tuesday, 30th September 2025 06:07 17:49

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