Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
With the arrival of September, Chamonix experiences a modest decline in average high-temperatures, transitioning from a refreshing 16.8°C (62.2°F) in August to a cool 12.8°C (55°F). During September nights, Chamonix witnesses a consistent average temperature of 3.6°C (38.5°F).Humidity
The average relative humidity in September is 81%.Rainfall
September is the month with the least rainfall in Chamonix. Rain falls for 11.4 days and accumulates 15mm (0.59") of precipitation.Snowfall
In Chamonix, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 06:54 and sunset at 20:10. On the last day of September, sunrise is at 07:30 and sunset at 19:14 CEST.
Sunshine
In Chamonix, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September in Chamonix, France, is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the UV index of 2 transforms into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Frequently asked questions
What are the temperatures in Chamonix in September?
What is the average humidity in September in Chamonix?
What is the driest month in Chamonix?
How many days does it rain in September in Chamonix?
When it does not snow in Chamonix?
Does it snow in Chamonix in September?
How many hours of daylight does Chamonix have in September?
When are sunrise and sunset in September in Chamonix?
How many hours of sunshine does Chamonix have in September?
What is the UV index intensity in September in Chamonix?
Average temperature in September
Chamonix, France
- Average high temperature in September: 12.8°C
The warmest months (with the highest average high temperature) are July and August (16.8°C).
The month with the lowest average high temperature is January (-2.3°C).
- Average low temperature in September: 3.6°C
The month with the highest average low temperature is July (6.7°C).
The coldest month (with the lowest average low temperature) is January (-11.4°C).
Average pressure in September
Chamonix, France
- Average pressure in September: 1018.1mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.1mbar).
Average wind speed in September
Chamonix, France
- Average wind speed in September: 6.5km/h
The windiest month (with the highest average wind speed) is December (8.4km/h).
The calmest month (with the lowest average wind speed) is September (6.5km/h).
Average humidity in September
Chamonix, France
- Average humidity in September: 81%
The month with the highest relative humidity is March (91%).
The month with the lowest relative humidity is August (77%).
Average rainfall in September
Chamonix, France
- Average rainfall in September: 15mm
The wettest month (with the highest rainfall) is December (72mm).
The driest month (with the least rainfall) is September (15mm).
Average rainfall days in September
Chamonix, France
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is June (16.2 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in September
Chamonix, France
- Average snowfall in September: 0mm
The month with the highest snowfall is December (245mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Chamonix, France
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Chamonix, France
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Chamonix, France
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Chamonix, France
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, February, March and November (UV index 1).
Average cloud cover in September
Chamonix, France
- Average cloud cover in September: 39
The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Chamonix, France
- Average visibility in September: 7km
The months with the highest visibility are June, July, August and October (8km).
The months with the lowest visibility are January, February and March (6km).
Chamonix, France
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