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

Partly Cloudy

24%

Fog

23%

Moderate rain at times

9%

Weather at 12pm
59°F

Partly Cloudy

25%

Moderate or heavy rain in area with thunder

12%

Moderate rain at times

9%

Weather at 6pm
45°F

Clear/Sunny

26%

Moderate rain at times

19%

Partly Cloudy

12%

Weather at 3am
40°F

Clear/Sunny

32%

Moderate rain at times

22%

Fog

20%

Partly Cloudy

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.

more information about French Alps's weather in september


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:

01-09-2024
Patchy rain nearby
45°F to 76°F
02-09-2024
Patchy rain nearby
49°F to 68°F
03-09-2024
Patchy rain nearby
47°F to 70°F
04-09-2024
Patchy rain nearby
45°F to 65°F
05-09-2024
Patchy light rain in area with thunder
54°F to 63°F
06-09-2024
Clear/Sunny
38°F to 70°F
07-09-2024
Clear/Sunny
40°F to 76°F
08-09-2024
Patchy rain nearby
41°F to 70°F
09-09-2024
Mist
45°F to 52°F
10-09-2024
Clear/Sunny
36°F to 63°F
11-09-2024
Partly Cloudy
32°F to 59°F
12-09-2024
Light rain shower
41°F to 49°F
13-09-2024
Patchy rain nearby
31°F to 41°F
14-09-2024
Clear/Sunny
23°F to 50°F
15-09-2024
Clear/Sunny
29°F to 58°F
16-09-2024
Clear/Sunny
31°F to 58°F
17-09-2024
Patchy rain nearby
32°F to 59°F
18-09-2024
Clear/Sunny
29°F to 61°F
19-09-2024
Patchy rain nearby
40°F to 61°F
20-09-2024
Clear/Sunny
32°F to 63°F
21-09-2024
Cloudy
34°F to 63°F
22-09-2024
Partly Cloudy
36°F to 63°F
23-09-2024
Light rain
49°F to 52°F
24-09-2024
Patchy rain nearby
32°F to 56°F
25-09-2024
Clear/Sunny
31°F to 58°F
26-09-2024
Light drizzle
50°F to 56°F
27-09-2024
Patchy light rain in area with thunder
41°F to 54°F
28-09-2024
Light drizzle
40°F to 41°F
29-09-2024
Clear/Sunny
25°F to 56°F
30-09-2024
Light rain shower
45°F to 59°F

Map: other cities in the French Alps in september

Cities near Chamonix:

Aiguille du Midi in septembervery bad weather
Saint-Gervais-les-Bains in septembervery bad weather
Passy in septembervery bad weather
Sallanches in septembertolerable weather
Megève in septembertolerable weather
Col du Petit Saint-Bernard in septembervery bad weather
Cluses in septembertolerable weather
Avoriaz in septembertolerable weather
La Clusaz in septembertolerable weather
Bourg-Saint-Maurice in septembertolerable weather
Bonneville in septembertolerable weather
La Roche-sur-Foron in septembertolerable weather
French Alps in september: See full list of cities

Click over cities on the map for information about the weather in september.

Legend: 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.


Weather in august in Chamonix
Weather in october in Chamonix
Change units