Jersey weather in September 2025

Expect 19°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Jersey in September. Check more long-term weather averages for Jersey in September before you book your next holiday to Jersey in 2025/2026.

  • 19°C maximum daytime temperature in September in Jersey (St Helier)19
    19°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Jersey (St Helier)13
    13 days with some rainfall
  • 13°C minimum night-time temperature in September in Jersey (St Helier)13
    13°C min night temperature
  • 13 hours of daylight per day in September in Jersey (St Helier)13
    13 hours of daylight per day
  • No heat & humidity in September in Jersey (St Helier)0
    No heat & humidity
  • 75 mm monthly rainfall in September in Jersey (St Helier)75
    75 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Jersey (St Helier)4
    4 (Moderate) UV index
  • 17°C sea temperature in September in Jersey (St Helier)17
    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 Jersey in September?

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

How sunny is it in Jersey in September?

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

How warm is the sea around Jersey in September?

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

Does it rain in Jersey in September?

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

Jersey September sunrise & sunset times

Browse the sunrise and sunset times for Jersey in September 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
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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