French Alps weather in September 2025

Expect 8°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in French Alps in September. Check more long-term weather averages for French Alps in September before you book your next holiday to French Alps in 2025/2026.

  • 8°C maximum daytime temperature in September in French Alps (Chamonix)8
    8°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in French Alps (Chamonix)13
    13 days with some rainfall
  • 2°C minimum night-time temperature in September in French Alps (Chamonix)2
    2°C min night temperature
  • 13 hours of daylight per day in September in French Alps (Chamonix)13
    13 hours of daylight per day
  • No heat & humidity in September in French Alps (Chamonix)0
    No heat & humidity
  • 129 mm monthly rainfall in September in French Alps (Chamonix)129
    129 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in French Alps (Chamonix)5
    5 (Moderate) UV index

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The September weather guide for French Alps (Chamonix) 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 the French Alps

How warm is it in the French Alps in September?

Daytime temperatures usually reach 8°C in Chamonix, French Alps in September, falling to 2°C at night.

How sunny is it in the French Alps in September?

There are normally 6 hours of bright sunshine each day in Chamonix, French Alps in September - that's 47% of daylight hours.

Does it rain in the French Alps in September?

There are usually 13 days with some rain in Chamonix, French Alps in September and the average monthly rainfall is 129mm.

French Alps September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:53 19:11
Monday, 15th September 2025 06:11 18:44
Tuesday, 30th September 2025 06:30 18:14

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