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.

St Helier sunrise & sunset times for September 2021

Browse the sunrise & sunset times for St Helier in September 2021. Select a month to view St Helier sunrise & sunset times for the next twelve 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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Metric (°C / mm)  |  Imperial (°F / inches)

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