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Hourly Forecast
Daylight Hours
07:30
Sunrise
19:15
Sunset
Moon
Waxing Gibbous
18:45
Moonrise
05:48
Moonset
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View stargazing scoreWeather in Chamonix-Mont-Blanc today, September 25, 2026
Chamonix-Mont-Blanc stays under cloudy skies on September 25, 2026, with only brief brighter breaks. Plan for a day that feels grey more often than open. Cloud leads the morning, peaking close to 88% near 08:00. Sunshine has little room until later in the day.
The day peaks near 20°C and cools toward 12°C. Moisture in the air spans 29%-88%, with the highest values around 21:00. Winds stay light, near 2.0 km/h by 22:00, so the day feels still more than breezy.
Expect persistent cloud later on, with amounts around 100% by 16:00. Sunshine remains the exception, not the rule. Visibility stays generally good near 41.4 km on average, though it can drop toward 25.1 km in thicker cloud or showers. Sunrise is at 07:30 and sunset at 19:15, giving 11 hours 45 minutes of sunlight today.
The practical takeaway for Chamonix-Mont-Blanc on September 25, 2026 is a cloudy day that stays usable, just not particularly bright, around 20°C.
Frequently asked questions about weather in Chamonix-Mont-Blanc
How warm does it get in Chamonix-Mont-Blanc?
The warmest month in Chamonix-Mont-Blanc is July, with average high temperatures of 19°C. The average temperature during this period is around 14°C.
How cold does it get in Chamonix-Mont-Blanc?
The coldest month in Chamonix-Mont-Blanc is January, with average low temperatures of -10°C. The average temperature during this period is around -6°C.
What is the wettest time of year in Chamonix-Mont-Blanc?
The wettest month in Chamonix-Mont-Blanc is December, with an average of 223mm of precipitation.
What is the driest time of year in Chamonix-Mont-Blanc?
The driest month in Chamonix-Mont-Blanc is February, with an average of 130mm of precipitation.
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