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
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's comfortable 19.8°C (67.6°F) to a still enjoyable 16°C (60.8°F). September nights in Collombey experience a consistent temperature drop to a chilly 6°C (42.8°F).Humidity
In September, the average relative humidity in Collombey is 80%.Rainfall
The month with the least rainfall is September, when the rain falls for 16.9 days and typically collects 54mm (2.13") of precipitation.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Collombey. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, there are 31.1 snowfall days, and 561mm (22.09") of snow is accumulated.Daylight
The average length of the day in September in Collombey is 12h and 32min.On the first day of the month, sunrise is at 06:53 and sunset at 20:10. On the last day of September, sunrise is at 07:30 and sunset at 19:14 CEST.
Sunshine
In Collombey, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September in Collombey is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: A maximum UV index of 3 in September translates into the following recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
What is the temperature in September in Collombey?
What is the average humidity in September in Collombey?
What is the driest month in Collombey?
How many days does it rain in September in Collombey?
When does it start to snow in Collombey?
What is the average length of the day in September in Collombey?
When is the sunrise / sunset in September in Collombey?
How long on average sun shines in September in Collombey?
What is the UV index intensity in September in Collombey?
Average temperature in September
Collombey, Switzerland
- Average high temperature in September: 16°C
The warmest months (with the highest average high temperature) are July and August (19.8°C).
The month with the lowest average high temperature is January (0.6°C).
- Average low temperature in September: 6°C
The month with the highest average low temperature is July (9.3°C).
The coldest month (with the lowest average low temperature) is February (-7.1°C).
Average pressure in September
Collombey, Switzerland
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021.1mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Collombey, Switzerland
- Average wind speed in September: 6.9km/h
The windiest month (with the highest average wind speed) is December (9.2km/h).
The calmest month (with the lowest average wind speed) is August (6.5km/h).
Average humidity in September
Collombey, Switzerland
- Average humidity in September: 80%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (77%).
Average rainfall in September
Collombey, Switzerland
- Average rainfall in September: 54mm
The wettest month (with the highest rainfall) is May (144mm).
The driest month (with the least rainfall) is September (54mm).
Average rainfall days in September
Collombey, Switzerland
- Average rainfall days in September: 16.9 days
The month with the highest number of rainy days is May (23.5 days).
The month with the least rainy days is October (13.3 days).
Average snowfall in September
Collombey, Switzerland
- Average snowfall in September: 1mm
The month with the highest snowfall is January (148mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Collombey, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (8.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Collombey, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Collombey, Switzerland
- Average sunshine days in September: 9.6 days
The month with the most sunshine days is October (15 days).
The month with the least sunshine days is May (4.3 days).
Average UV index in September
Collombey, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Collombey, Switzerland
- Average cloud cover in September: 33
The months with the most cloud cover are January, February, March, May and December (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Collombey, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are October and November (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September and December (8km).
Collombey, Switzerland
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