Chamonix-Mont-Blanc Weather in September
What's the weather like in Chamonix-Mont-Blanc (Rhône-Alpes) in September 2024?
The climate in Chamonix-Mont-Blanc during September can be summarized as cool and wet.
September is in the fall / autumn in Chamonix-Mont-Blanc and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cold 8°C (46°F), whilst at night 2°C (35°F) is normal.
| Daytime temperature | 7.9°C 46.2°F |
|---|---|
| Nightly temperature | 1.9°C 35.4°F |
| Average temperature | 4.9°C 40.8°F |
| Daily sunshine | 6.5 hrs |
| Avg rainfall | 129 mm 5.1 ins |
| Rainy days | 15 days |
| Sea temperature | 21.3°C 70.3°F |
| Humidity | 74% |
| Windspeed | 14.8kph 9 mph |
On average September is the 6th driest month of the year in Chamonix-Mont-Blanc with around 129mm 5.1 inches of rain making it a wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.5 hours of sunshine per day.
September temperatures in Chamonix-Mont-Blanc
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Chamonix-Mont-Blanc in September 2024.
Other monthly averages
Best places to visit in September
Chamonix-Mont-Blanc weather stats
| Hottest month: | July | 10.8°C 51.4°F |
|---|---|---|
| Driest month: | February | 113mm 4.4ins |
| Sunniest month: | July | 8.4hrs |
| Coldest month: | January | -5.5°C 22.1°F |
| Wettest month: | August | 152mm 6ins |
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