Chamonix weather in September 2025

Expect 46°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Chamonix in September. Check more long-term weather averages for Chamonix in September before you book your next holiday to France in 2025/2026.

  • 46°F maximum daytime temperature in September in Chamonix46
    46°F max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Chamonix13
    13 days with some rainfall
  • 36°F minimum night-time temperature in September in Chamonix36
    36°F min night temperature
  • 13 hours of daylight per day in September in Chamonix13
    13 hours of daylight per day
  • No heat & humidity in September in Chamonix0
    No heat & humidity
  • 5.1 inches monthly rainfall in September in Chamonix5.1
    5.1 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Chamonix5
    5 (Moderate) UV index

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Chamonix by month

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The September weather guide for France (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)  |  Imperial (°F)

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More about France

How warm is it in Chamonix in September?

Daytime temperatures usually reach 46°F in Chamonix in September, falling to 36°F at night.

How sunny is it in Chamonix in September?

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

Does it rain in Chamonix in September?

There are usually 13 days with some rain in Chamonix in September and the average monthly rainfall is 5.1 inches.

Chamonix September sunrise & sunset times

Browse the sunrise and sunset times for Chamonix in September 2025. Select a month to view Chamonix 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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