Chamonix in september: average Weather, Temperature and Climate
Weather in Chamonix in september 2025
The weather in Chamonix in september comes from statistical datas on the last years. You can view the weather statistics for all the month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
very bad weather 12.7cm
Weather at 6am
41°F
Clear/Sunny
39% of time
24%
23%
9%
Weather at 12pm
59°F
Clear/Sunny
49% of time
25%
12%
9%
Weather at 6pm
45°F
Fog
29% of time
26%
19%
12%
Weather at 3am
40°F
32%
22%
20%
18%
Evolution of daily average temperature and precipitation in Chamonix in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Chamonix in september.
The climate of Chamonix in september is very bad
In september in Chamonix, the climate is wet (with 3.3in of precipitation over 6 days). It should be noted an improvement from the previous month since in august it receives an average of 5.1in of rainfall over 9 days.
The climate is quite cold in that locality the month of september, but it is tolerable by dressing hot. The high seasonal norm is 59°F. The minimum is 41°F. Thus, the mean temperature average on this month of september in Chamonix is 50°F. These temperatures are far removed from those records observed in Chamonix in the month of september with a maximum record of 76°F in 2009 and a minimum record of 22°F in 2010. You need to prepare to have about 3 days with temperatures under 32°F, or 10% of the month.
In september in Chamonix, the days on average last 12:33. Sunrise is at 06:11 and sets at 18:44.
With a good weather, september is a good month to go there.
Chamonix: another month?
If you can push the dates of your trip to Chamonix forward, the month of october has a better weather forecast than september. more information
September: another location in the French Alps?
If you want to go to the French Alps in september, there are destinations with better weather than Chamonix:
In september, Grenoble (Isère), Aix-les-Bains, Annecy (Haute-Savoie), Chambéry, Bourget Lake (Lac du Bourget) and Thonon-les-Bains have good weather.
Finally, Alpe d'Huez, La Clusaz, Les Menuires, Val Thorens, Avoriaz and Briançon have a tolerable climate, but better than Chamonix.
Seasonal average climate and temperature of Chamonix in september
Check below seasonal norms These statistics are set from the weather statements earlier years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 50°F | ||||
| Highest temperature | 59°F | ||||
| Lowest temperature | 41°F | ||||
| Highest record temperature | 76°F (2009) | ||||
| Lowest record temperature | 22°F (2010) | ||||
| Number of days at +65°F | 10 day(s) (33%) | ||||
| Number of days at -32°F | 3 day(s) (10%) | ||||
| Wind | |||||
| Wind speed | 10km/h | ||||
| Wind temperature | 40°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.3in | ||||
| Number of days with rainfall | 6 day(s) (19%) | ||||
| Record daily rainfall | 1.6in (2011) | ||||
| Snowfall | 12.7cm | ||||
| Other climate data | |||||
| Humidity | 88% | ||||
| Visibility | 7.96km | ||||
| Cloud cover | 38% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:11 | ||||
| Time of sunset | 18:44 | ||||
| Length of day | 12:33 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last september?
Here is the day by day recorded weather in Chamonix in september 2024:
45°F to 76°F
49°F to 68°F
47°F to 70°F
45°F to 65°F
54°F to 63°F
38°F to 70°F
40°F to 76°F
41°F to 70°F
45°F to 52°F
36°F to 63°F
32°F to 59°F
41°F to 49°F
31°F to 41°F
23°F to 50°F
29°F to 58°F
31°F to 58°F
32°F to 59°F
29°F to 61°F
40°F to 61°F
32°F to 63°F
34°F to 63°F
36°F to 63°F
49°F to 52°F
32°F to 56°F
31°F to 58°F
50°F to 56°F
41°F to 54°F
40°F to 41°F
25°F to 56°F
45°F to 59°F
Map: other cities in the French Alps in september
Cities near Chamonix:
| Aiguille du Midi in september | very bad weather |
| Saint-Gervais-les-Bains in september | very bad weather |
| Passy in september | very bad weather |
| Sallanches in september | tolerable weather |
| Megève in september | tolerable weather |
| Col du Petit Saint-Bernard in september | very bad weather |
| Cluses in september | tolerable weather |
| Avoriaz in september | tolerable weather |
| La Clusaz in september | tolerable weather |
| Bourg-Saint-Maurice in september | tolerable weather |
| Bonneville in september | tolerable weather |
| La Roche-sur-Foron in september | tolerable weather |
Click over cities on the map for information about the weather in september.
Chamonix
perfect weather
good
tolerable
bad
very bad
Weather data for Chamonix in september:
Weather data for Chamonix for september are derived from an average of the weather forecast since 2009 in Chamonix. There is a margin of error and these forecasts are to be considered as general information only. The weather in Chamonix can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Chamonix.