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
The onset of September aligns with a soft reduction in the average high-temperature, gently falling from an agreeable 22.1°C (71.8°F) in August to a comfortable 17.8°C (64°F). In September, Donneloye experiences an average nighttime temperature of 7.7°C (45.9°F).Humidity
The average relative humidity in September is 82%.Rainfall
September is the month with the least rainfall. Rain falls for 7.1 days and accumulates 8mm (0.31") of precipitation.Snowfall
In Donneloye, Switzerland, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 33min.On the first day of September in Donneloye, Switzerland, sunrise is at 06:53 and sunset at 20:12. On the last day of the month, sunrise is at 07:31 and sunset at 19:14 CEST.
Sunshine
In September, the average sunshine in Donneloye, Switzerland, is 8.6h.UV index
In Donneloye, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The UV index of 3 during September leads to these advisories:
Exercise care. People with light skin might get burns in fewer than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Frequently asked questions
What is the usual temperature for Donneloye in September?
What is the average humidity in September in Donneloye?
What is the driest month in Donneloye?
How many days does it rain in September in Donneloye?
When it does not snow in Donneloye?
Does it snow in Donneloye in September?
What is the average length of the day in September in Donneloye?
When are sunrise and sunset in September in Donneloye?
How long on average sun shines in September in Donneloye?
What is the UV index intensity in September in Donneloye?
Average temperature in September
Donneloye, Switzerland
- Average high temperature in September: 17.8°C
The warmest months (with the highest average high temperature) are July and August (22.1°C).
The month with the lowest average high temperature is January (2.5°C).
- Average low temperature in September: 7.7°C
The month with the highest average low temperature is July (11.3°C).
The coldest month (with the lowest average low temperature) is January (-3.8°C).
Average pressure in September
Donneloye, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1021.1mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).
Average wind speed in September
Donneloye, Switzerland
- Average wind speed in September: 7.7km/h
The windiest month (with the highest average wind speed) is February (11km/h).
The calmest month (with the lowest average wind speed) is August (6.6km/h).
Average humidity in September
Donneloye, Switzerland
- Average humidity in September: 82%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and July (79%).
Average rainfall in September
Donneloye, Switzerland
- Average rainfall in September: 8mm
The wettest month (with the highest rainfall) is June (26mm).
The driest month (with the least rainfall) is September (8mm).
Average rainfall days in September
Donneloye, Switzerland
- Average rainfall days in September: 7.1 days
The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (6.2 days).
Average snowfall in September
Donneloye, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (25mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Donneloye, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (4.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Donneloye, Switzerland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Donneloye, Switzerland
- Average sunshine days in September: 20.2 days
The month with the most sunshine days is October (23.5 days).
The month with the least sunshine days is May (15.8 days).
Average UV index in September
Donneloye, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Donneloye, Switzerland
- Average cloud cover in September: 37
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Donneloye, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are March, April, November and December (9km).
The months with the lowest visibility are January, February, May, June, July, August, September and October (8km).
Donneloye, Switzerland
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