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
September
Weather in September
Temperature
The arrival of September correlates with a minor temperature reduction, down from August's enjoyable 16.4°C (61.5°F) to a cool 12.3°C (54.1°F). Chalais, in September, experiences an average temperature of 3.3°C (37.9°F) at night.Humidity
In Chalais, the average relative humidity in September is 82%.Rainfall
September and October are months with the least rain when the rain falls for 16.5 days and typically aggregates up to 54mm (2.13") of rain.Snowfall
January through December are months with snowfall. In Chalais, Switzerland, in September, snow falls for 2.1 days, with typically accumulated 36mm (1.42") of snow. In Chalais, during the entire year, snow falls for 129 days and aggregates up to 4010mm (157.87") of snow.Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 06:51 and sunset at 20:08. On the last day of September, sunrise is at 07:27 and sunset at 19:11 CEST.
Sunshine
In September, the average sunshine is 8.1h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Chalais in September?
What is the average humidity in September in Chalais?
What is the driest month in Chalais?
How much does it rain in Chalais in September?
How many days does it snow in September in Chalais?
How many hours of daylight does Chalais have in September?
When are sunrise and sunset in September in Chalais?
How many hours of sunshine does Chalais have in September?
What is the UV index intensity in September in Chalais?
Average temperature in September
Chalais, Switzerland
- Average high temperature in September: 12.3°C
The warmest month (with the highest average high temperature) is July (16.5°C).
The month with the lowest average high temperature is January (-2.6°C).
- Average low temperature in September: 3.3°C
The month with the highest average low temperature is August (6.4°C).
The coldest month (with the lowest average low temperature) is February (-11.3°C).
Average pressure in September
Chalais, Switzerland
- Average pressure in September: 1018.3mbar
The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in September
Chalais, Switzerland
- 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 August (6.2km/h).
Average humidity in September
Chalais, Switzerland
- Average humidity in September: 82%
The month with the highest relative humidity is March (91%).
The months with the lowest relative humidity are July and August (79%).
Average rainfall in September
Chalais, Switzerland
- Average rainfall in September: 54mm
The wettest month (with the highest rainfall) is May (126mm).
The driest months (with the least rainfall) are September and October (54mm).
Average rainfall days in September
Chalais, Switzerland
- Average rainfall days in September: 16.5 days
The month with the highest number of rainy days is July (22.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Chalais, Switzerland
- Average snowfall in September: 36mm
The month with the highest snowfall is December (887mm).
The month with the least snowfall is July (5mm).
Average snowfall days in September
Chalais, Switzerland
- Average snowfall days in September: 2.1 days
The month with the highest number of snowfall days is March (21.1 days).
The month with the least snowfall days is August (0.4 days).
Average daylight in September /
Average sunshine in September
Chalais, Switzerland
- 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 1min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Chalais, Switzerland
- Average sunshine days in September: 9.7 days
The month with the most sunshine days is October (15.4 days).
The month with the least sunshine days is May (4.2 days).
Average UV index in September
Chalais, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, March, April and November (UV index 1).
Average cloud cover in September
Chalais, Switzerland
- Average cloud cover in September: 43
The month with the most cloud cover is March (Cloud cover 56).
The month with the least cloud cover is October (Cloud cover 38).
Average visibility in September
Chalais, Switzerland
- 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).
