Mont St Michel weather in September 2025

Expect daytime maximum temperatures of 20°C in Mont St Michel 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 62 mm of rainfall in the month.

  • 20°C maximum daytime temperature in September in Mont St Michel20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Mont St Michel13
    13 days with some rainfall
  • 12°C minimum night-time temperature in September in Mont St Michel12
    12°C min night temperature
  • 13 hours of daylight per day in September in Mont St Michel13
    13 hours of daylight per day
  • No heat & humidity in September in Mont St Michel0
    No heat & humidity
  • 62 mm monthly rainfall in September in Mont St Michel62
    62 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Mont St Michel4
    4 (Moderate) UV index
  • 18°C sea temperature in September in Mont St Michel18
    18°C sea temperature

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The September weather guide for France (Mont St Michel) 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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More about France

How hot is it in Mont St Michel in September?

Daytime temperatures usually reach 20°C in Mont St Michel in September, falling to 12°C at night.

How sunny is it in Mont St Michel in September?

There are normally 6 hours of bright sunshine each day in Mont St Michel in September - that's 47% of daylight hours.

How warm is the sea around Mont St Michel in September?

The average sea temperature around Mont St Michel in September is 18°C.

Does it rain in Mont St Michel in September?

There are usually 13 days with some rain in Mont St Michel in September and the average monthly rainfall is 62mm.

Mont St Michel September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:23 19:48
Monday, 15th September 2025 06:43 19:18
Tuesday, 30th September 2025 07:04 18:47

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