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Weather in Chamonix-Mont-Blanc for September 2025

Your guide to Chamonix-Mont-Blanc weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Chamonix-Mont-Blanc during September is quite rare, with fewer than 2 snowy days on average.
    According to Chamonix-Mont-Blanc snow forecast for September 2025, no snow is expected until the end of the month.

    • Temperatures

  • Until now, September 2025 in Chamonix-Mont-Blanc is slightly cooler than the historical average by -1.7 °C.

  • The forecast for the next days in Chamonix-Mont-Blanc predicts a temperature of 10.4 °C, which is cooler than the historical average.

  • In general, the average temperature in Chamonix-Mont-Blanc at the beginning of September is 17 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 5.4 °C by the end of September.

    • Rain 🌧️

  • Chamonix-Mont-Blanc in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 133.4 mm.

    • More

  • Is September a good time to visit Chamonix-Mont-Blanc? check out the best time to travel to Chamonix-Mont-Blanc page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
9
Dry days
Average rainy days
20
Rainy days
Average snowy days
1
Snow days
Average temperatures
13°/5°
Temperatures
Average wind speed
9 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Chamonix-Mont-Blanc Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
15°
2
Sunny
15°
3
Sunny
18°
4
Patchy light rain with thunder
17°
5
Patchy light rain with thunder
15°
6
Sunny
19°
7
Sunny
20°
8
Patchy rain possible
17°
9
Patchy rain possible
13°
10
Patchy rain possible
15°
11
Sunny
14°
12
Thundery outbreaks possible
11°
13
Fog
8°
14
Thundery outbreaks possible
11°
15
Partly cloudy
13°
16
Patchy rain possible
13°
17
Sunny
15°
18
Sunny
20°
19
Patchy rain possible
21°
20
Patchy rain possible
20°
21
Patchy rain possible
13°
22
Patchy rain possible
11°
23
Patchy rain possible
7°
24
Light drizzle
2°
25
Light freezing rain
1°
26
Sunny
5°
27
Sunny
5°
28
Sunny
9°
29
Patchy rain possible
3°
30
Mist
13°

Temperatures trend during September in Chamonix-Mont-Blanc

See the weather trend as well as the moving average line

September weather in Chamonix-Mont-Blanc day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
1 Sept. Sunny
Sunny
 15° /6° 16.4 mm 0 cm
2 Sept. Sunny
Sunny
 15° /6° 5.7 mm 0 cm
3 Sept. Sunny
Sunny
 18° /7° 3.2 mm 0 cm
4 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 17° /8° 14.7 mm 0 cm
5 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 15° /7° 4.8 mm 0 cm
6 Sept. Sunny
Sunny
 19° /6° 0 mm 0 cm
7 Sept. Sunny
Sunny
 20° /8° 0.9 mm 0 cm
8 Sept. Patchy rain possible
Patchy rain possible
 17° /8° 6.5 mm 0 cm
9 Sept. Patchy rain possible
Patchy rain possible
 13° /7° 8.3 mm 0 cm
10 Sept. Patchy rain possible
Patchy rain possible
 15° /6° 2.4 mm 0 cm
11 Sept. Sunny
Sunny
 14° /6° 3.1 mm 0 cm
12 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 11° /3° 2.9 mm 0 cm
13 Sept. Fog
Fog
 8° /3° 5.6 mm 1.4 cm
14 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 11° /3° 3.4 mm 0 cm
15 Sept. Partly cloudy
Partly cloudy
 13° /3° 0 mm 0 cm
16 Sept. Patchy rain possible
Patchy rain possible
 13° /5° 1 mm 0 cm
17 Sept. Sunny
Sunny
 15° /5° 0 mm 0 cm
18 Sept. Sunny
Sunny
 20° /9° 0 mm 0 cm
19 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 0.3 mm 0 cm
20 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 0.7 mm 0 cm
21 Sept. Patchy rain possible
Patchy rain possible
 13° /8° 2 mm 0 cm
22 Sept. Patchy rain possible
Patchy rain possible
 11° /7° 1 mm 0 cm
23 Sept. Patchy rain possible
Patchy rain possible
 7° /4° 4.8 mm 0 cm
24 Sept. Light drizzle
Light drizzle
 2° /-1° 4.4 mm 0 cm
25 Sept. Light freezing rain
Light freezing rain
 1° /-3° 0.7 mm 0 cm
26 Sept. Sunny
Sunny
 5° /-5° 0 mm 0 cm
27 Sept. Sunny
Sunny
 5° /-2° 0 mm 0 cm
28 Sept. Sunny
Sunny
 9° /-1° 0 mm 0 cm
29 Sept. Patchy rain possible
Patchy rain possible
 3° /1° 4.6 mm 0 cm
30 Sept. Mist
Mist
 13° /5° 4.7 mm 0 cm
Next
Important Notice
Our weather forecast for Chamonix-Mont-Blanc in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Chamonix-Mont-Blanc forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Chamonix-Mont-Blanc weather in September vs August vs October

Compare September weather in Chamonix-Mont-Blanc with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Sunny
Sunny
Temperatures19°/9°13°/5°9°/3°
Rainfall174 mm133 mm152 mm
Snowfall0 cm2 cm1 cm
Wind8.9 km/h9.2 km/h9.9 km/h
Humidity71%76%77%
Rainy days20 days20 days20 days
Snow days0 days1 days1 days
Dry days11 days9 days10 days

Planning a trip to Chamonix-Mont-Blanc? Discover the best time to visit

Chamonix-Mont-Blanc in September - FAQ

What are the expected maximum and minimum temperatures in Chamonix-Mont-Blanc during September?
During September, expect a variety of temperatures with highs around 13° and lows near 5°, suitable for diverse activities and preferences.
How much rainfall should be expected in Chamonix-Mont-Blanc during September?
Significant rainfall exceeding 133.4 mm is expected in Chamonix-Mont-Blanc during September, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Chamonix-Mont-Blanc in September 2025?
Chamonix-Mont-Blanc typically sees 2.05 cm of snowfall during September.
What are the typical wind conditions in Chamonix-Mont-Blanc during September?
The average wind speed in Chamonix-Mont-Blanc during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Chamonix-Mont-Blanc in September?

As you prepare for your trip to Chamonix-Mont-Blanc in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Chamonix-Mont-Blanc, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

Chamonix-Mont-Blanc snow forecast September 2025

Track daily snowfall levels and discover Chamonix-Mont-Blanc’s snowy potential this September ❄️

September rainfall patterns in Chamonix-Mont-Blanc

Explore the daily rainfall trends and prepare for Chamonix-Mont-Blancs September weather 💧

UV exposure in Chamonix-Mont-Blanc during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Chamonix-Mont-Blanc?

Get accurate weather forecasts for Chamonix-Mont-Blanc, located at latitude 45.924 and longitude 6.869. Stay updated with localized weather information tailored for Chamonix-Mont-Blanc.

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