September weather forecastBellevue, Switzerland
September
Weather in September
September, the first month of the autumn in Bellevue, is still a refreshing month, with an average temperature fluctuating between 18°C (64.4°F) and 8.4°C (47.1°F).Temperature
The onset of September brings a small shift in high-temperatures, falling from an agreeable 22.4°C (72.3°F) in August to an enjoyable 18°C (64.4°F). In the month of September, Bellevue experiences an average low-temperature of 8.4°C (47.1°F).Humidity
In September, the average relative humidity is 82%.Rainfall
In September, in Bellevue, the rain falls for 13.9 days. Throughout September, 46mm (1.81") of precipitation is accumulated. Throughout the year, there are 190.1 rainfall days, and 748mm (29.45") of precipitation is accumulated.Snowfall
May through September are months without snowfall in Bellevue.Daylight
In September, the average length of the day is 12h and 32min.On the first day of the month, sunrise is at 06:56 and sunset at 20:14. On the last day of September, sunrise is at 07:33 and sunset at 19:17 CEST.
Sunshine
In Bellevue, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September in Bellevue, Switzerland, is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 3 in September interprets into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bellevue, Switzerland
- Average high temperature in September: 18°C
The warmest month (with the highest average high temperature) is July (22.7°C).
The month with the lowest average high temperature is January (2.7°C).
- Average low temperature in September: 8.4°C
The month with the highest average low temperature is July (11.7°C).
The coldest month (with the lowest average low temperature) is February (-3.4°C).
Average pressure in September
Bellevue, Switzerland
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is December (1021.2mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Bellevue, Switzerland
- Average wind speed in September: 7km/h
The windiest month (with the highest average wind speed) is February (9.5km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in September
Bellevue, Switzerland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are April, July and August (79%).
Average rainfall in September
Bellevue, Switzerland
- Average rainfall in September: 46mm
The wettest month (with the highest rainfall) is June (86mm).
The driest month (with the least rainfall) is October (41mm).
Average rainfall days in September
Bellevue, Switzerland
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is May (20.3 days).
The month with the least rainy days is February (11.7 days).
Average snowfall in September
Bellevue, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (81mm).
The months with the least snowfall are May, June, July, August and September (0mm).
Average snowfall days in September
Bellevue, Switzerland
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (6.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bellevue, 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: 8h and 30min
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: 4h and 54min).
Average sunshine days in September
Bellevue, Switzerland
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is October (15.9 days).
The month with the least sunshine days is June (7.7 days).
Average UV index in September
Bellevue, 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
Bellevue, Switzerland
- Average cloud cover in September: 36
The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Bellevue, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are March and April (9km).
The months with the lowest visibility are January, February, May, June, July, August, September, October, November and December (8km).
