September weather forecastPrilly, Switzerland
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Prilly, Switzerland, with an average temperature ranging between min 9.2°C (48.6°F) and max 18.3°C (64.9°F).Temperature
September ushers in a minor alteration in Prilly's climate, with the average high-temperature moving from August's agreeable 22.1°C (71.8°F) to an enjoyable 18.3°C (64.9°F). September witnesses an average low-temperature hovering around a frosty 9.2°C (48.6°F).Humidity
In September, the average relative humidity is 79%.Rainfall
The month with the least rainfall in Prilly is September, when the rain falls for 12.5 days and typically collects 38mm (1.5") of precipitation.Snowfall
June through September are months without snowfall in Prilly.Daylight
The average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 06:54 and sunset at 20:12. On the last day of September, sunrise is at 07:31 and sunset at 19:15 CEST.
Sunshine
In Prilly, the average sunshine in September is 9.1h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Exercise prevention - Warding off sunburn is urged. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Prilly, Switzerland
- Average high temperature in September: 18.3°C
The warmest month (with the highest average high temperature) is July (22.2°C).
The month with the lowest average high temperature is January (3.3°C).
- Average low temperature in September: 9.2°C
The month with the highest average low temperature is July (12.6°C).
The coldest months (with the lowest average low temperature) are January and February (-2.2°C).
Average pressure in September
Prilly, Switzerland
- Average pressure in September: 1018.5mbar
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
Prilly, Switzerland
- Average wind speed in September: 8.4km/h
The windiest month (with the highest average wind speed) is February (12.1km/h).
The calmest month (with the lowest average wind speed) is August (7km/h).
Average humidity in September
Prilly, Switzerland
- Average humidity in September: 79%
The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall in September
Prilly, Switzerland
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is December (103mm).
The driest month (with the least rainfall) is September (38mm).
Average rainfall days in September
Prilly, Switzerland
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (11.8 days).
Average snowfall in September
Prilly, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (184mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Prilly, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Prilly, Switzerland
- Average daylight in September: 12h and 30min
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: 9h and 6min
The months with the most sunshine are July and August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Prilly, Switzerland
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is October (16 days).
The month with the least sunshine days is June (6.7 days).
Average UV index in September
Prilly, Switzerland
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Prilly, Switzerland
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Prilly, Switzerland
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
