Chamonix-Mont-Blanc
September
Weather in Chamonix-Mont-Blanc for September 2025
Your guide to Chamonix-Mont-Blanc weather in September - trends and predictions
In general, the average temperature in Chamonix-Mont-Blanc at the beginning of September is 18.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.1 °C by the end of September.
The climate of Chamonix-Mont-Blanc in September is notably wet, with an average of 11 rainy days.
Is September a good time to visit Chamonix-Mont-Blanc? check out the best time to travel to Chamonix-Mont-Blanc page.
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19
Dry days
11
Rainy days
0
Snow days
16°/7°
Temperatures
8 km/h
Avg max wind
73 %
Avg humidity
Chamonix-Mont-Blanc in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  18° | 2 17° | 3 18° | 4 18° | 5 17° | 6 19° | 7  20° |
| 8 18° | 9 14° | 10 17° | 11 16° | 12  11° | 13  5° | 14 9° |
| 15  13° | 16 12° | 17 15° | 18  12° | 19 12° | 20  13° | 21 13° |
| 22  11° | 23 6° | 24 11° | 25 12° | 26 13° | 27 14° | 28 9° |
| 29 13° | 30 13° |
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Temperatures trend during September in Chamonix-Mont-Blanc
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Sept. | Sunny | 18° /7° | 3.3 mm | 0 cm | |
| 2 Sept. | Sunny | 17° /7° | 4.5 mm | 0 cm | |
| 3 Sept. | Sunny | 18° /8° | 4.8 mm | 0 cm | |
| 4 Sept. | Sunny | 18° /9° | 7.4 mm | 0 cm | |
| 5 Sept. | Sunny | 17° /9° | 6.3 mm | 0 cm | |
| 6 Sept. | Sunny | 19° /7° | 0 mm | 0 cm | |
| 7 Sept. | Patchy rain possible | 20° /8° | 1.4 mm | 0 cm | |
| 8 Sept. | Patchy rain possible | 18° /8° | 6.2 mm | 0 cm | |
| 9 Sept. | Patchy rain possible | 14° /7° | 3.5 mm | 0 cm | |
| 10 Sept. | Patchy rain possible | 17° /7° | 0.3 mm | 0 cm | |
| 11 Sept. | Sunny | 16° /7° | 4.6 mm | 0 cm | |
| 12 Sept. | Thundery outbreaks possible | 11° /4° | 4.3 mm | 0 cm | |
| 13 Sept. | Fog | 5° /2° | 5.3 mm | 2 cm | |
| 14 Sept. | Thundery outbreaks possible | 9° /2° | 0 mm | 0 cm | |
| 15 Sept. | Partly cloudy | 13° /3° | 0 mm | 0 cm | |
| 16 Sept. | Light rain shower | 12° /4° | 1 mm | 0 cm | |
| 17 Sept. | Thundery outbreaks possible | 15° /5° | 0.5 mm | 0 cm | |
| 18 Sept. | Moderate rain | 12° /4° | 9.2 mm | 0 cm | |
| 19 Sept. | Patchy rain possible | 12° /3° | 4.2 mm | 0 cm | |
| 20 Sept. | Patchy light drizzle | 13° /4° | 1.5 mm | 0 cm | |
| 21 Sept. | Patchy rain possible | 13° /5° | 0.7 mm | 0 cm | |
| 22 Sept. | Patchy light rain with thunder | 11° /3° | 12.4 mm | 0 cm | |
| 23 Sept. | Light rain | 6° /1° | 11.2 mm | 0 cm | |
| 24 Sept. | Sunny | 11° /0° | 0.4 mm | 0 cm | |
| 25 Sept. | Sunny | 12° /2° | 0 mm | 0 cm | |
| 26 Sept. | Sunny | 13° /5° | 28.9 mm | 0 cm | |
| 27 Sept. | Sunny | 14° /4° | 3.7 mm | 0 cm | |
| 28 Sept. | Sunny | 9° /3° | 3 mm | 0 cm | |
| 29 Sept. | Sunny | 13° /3° | 0.1 mm | 0 cm | |
| 30 Sept. | Mist | 13° /5° | 4.7 mm | 0 cm | |
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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.
Chamonix-Mont-Blanc in September - FAQ
What are the expected maximum and minimum temperatures in Chamonix-Mont-Blanc during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Chamonix-Mont-Blanc during September?
Moderate rainfall is anticipated in Chamonix-Mont-Blanc during September, with a total of 82.6 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Chamonix-Mont-Blanc during September?
The average wind speed in Chamonix-Mont-Blanc during September is 8 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
September rainfall patterns in Chamonix-Mont-Blanc
Explore the daily rainfall trends and prepare for Chamonix-Mont-Blancs September weather 💧
September snowfall in Chamonix-Mont-Blanc
Track daily snowfall levels and discover Chamonix-Mont-Blanc’s snowy potential this September ❄️
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