September weather forecastCéligny, Switzerland
September
Weather in September
September, the first month of the autumn in Céligny, is still a comfortable month, with an average temperature varying between 17.5°C (63.5°F) and 8.2°C (46.8°F).Temperature
September reveals a small adjustment in temperature, transitioning from an average high of a pleasant 21.8°C (71.2°F) in August to a comfortable 17.5°C (63.5°F). Céligny witnesses an average low-temperature of 8.2°C (46.8°F) throughout the month of September.Humidity
The average relative humidity in September in Céligny is 84%.Rainfall
September is the month with the least rainfall in Céligny. Rain falls for 16.2 days and accumulates 84mm (3.31") of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Céligny, Switzerland. Throughout September, in the average 0.3 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, there are 91.9 snowfall days, and 3413mm (134.37") of snow is accumulated.Daylight
The average length of the day in September in Céligny, Switzerland, is 12h and 33min.On the first day of the month, sunrise is at 06:56 and sunset at 20:13. On the last day of September, in Céligny, sunrise is at 07:33 and sunset at 19:16 CEST.
Sunshine
In September, the average sunshine is 7.8h.UV index
The average daily maximum UV index in September in Céligny, Switzerland, 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 average individuals.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Act with care - Obligation to protect against skin and eye damage is highlighted. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Céligny, Switzerland
- Average high temperature in September: 17.5°C
The warmest months (with the highest average high temperature) are July and August (21.8°C).
The month with the lowest average high temperature is January (2.3°C).
- Average low temperature in September: 8.2°C
The month with the highest average low temperature is July (11.2°C).
The coldest month (with the lowest average low temperature) is February (-3.7°C).
Average pressure in September
Céligny, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1021.2mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).
Average wind speed in September
Céligny, Switzerland
- Average wind speed in September: 7.8km/h
The windiest month (with the highest average wind speed) is February (10.8km/h).
The calmest month (with the lowest average wind speed) is August (6.7km/h).
Average humidity in September
Céligny, Switzerland
- Average humidity in September: 84%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are July and August (81%).
Average rainfall in September
Céligny, Switzerland
- Average rainfall in September: 84mm
The wettest month (with the highest rainfall) is December (173mm).
The driest month (with the least rainfall) is September (84mm).
Average rainfall days in September
Céligny, Switzerland
- Average rainfall days in September: 16.2 days
The months with the highest number of rainy days are May and June (22.8 days).
The month with the least rainy days is February (6.7 days).
Average snowfall in September
Céligny, Switzerland
- Average snowfall in September: 1mm
The month with the highest snowfall is December (833mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Céligny, Switzerland
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Céligny, Switzerland
- Average daylight in September: 12h and 30min
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: 7h and 48min
The month with the most sunshine is August (Average sunshine: 9h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in September
Céligny, Switzerland
- Average sunshine days in September: 10.9 days
The month with the most sunshine days is October (13.5 days).
The month with the least sunshine days is June (5.9 days).
Average UV index in September
Céligny, 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, October, November and December (UV index 2).
Average cloud cover in September
Céligny, Switzerland
- Average cloud cover in September: 42
The months with the most cloud cover are January, February and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 37).
Average visibility in September
Céligny, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (8km).
The month with the lowest visibility is January (7km).
