St Helier weather in September 2021

  • 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 St Helier, Jersey 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 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.

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

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St Helier sunrise & sunset times for September 2021

Browse the sunrise and sunset times for St Helier in September 2021. Select a month to view St Helier sunrise & sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st September 2021 06:25 19:51
Wednesday, 15th September 2021 06:45 19:21
Thursday, 30th September 2021 07:07 18:49
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