September weather forecastNyon, Switzerland
September weather for Nyon, Switzerland: In Nyon, Switzerland, in September, during 16.2 rainfall days, 84mm (3.31") of precipitation is typically accumulated. On the first day of September in Nyon, Switzerland, sunrise is at 06:55 and sunset at 20:13.
September
Weather in September
With September, Nyon slides into a transitional period, as summer says goodbye and autumn advances. The first streaks of autumnal shades start to appear in the lush green cityscape. On the verge of another climate shift, September records marginal snowfall; a solitary 1mm (0.04"). As the leaves commence their spectacular color shift, the city prepares for cooler nights and darker days. As autumn sets in, September bids a mellow adieu to the vibrant summer days.Temperature
With the beginning of September, the average high-temperature in Nyon, Switzerland, shows a small decrease, transitioning from a pleasant 21.8°C (71.2°F) in August to a comfortable 17.5°C (63.5°F). In Nyon, the nighttime temperature averages to a chilly 8.2°C (46.8°F) during September.Humidity
In Nyon, Switzerland, the average relative humidity in September is 84%.Rainfall
September is the month with the least rainfall. 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 Nyon. 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 Nyon is 12h and 33min.On the first day of September in Nyon, Switzerland, sunrise is at 06:55 and sunset at 20:13. On the last day of the month, sunrise is at 07:32 and sunset at 19:16 CEST.
Sunshine
In Nyon, the average sunshine in September is 7.8h.UV index
In Nyon, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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
Nyon, 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).
