September weather forecastSarnen, Switzerland
September
Weather in September
September, the first month of the autumn in Sarnen, is still a refreshing month, with an average temperature varying between 5.3°C (41.5°F) and 14.8°C (58.6°F).Temperature
September brings a slight decrease in temperature, down from a comfortable 18.9°C (66°F) in August to a mild 14.8°C (58.6°F). During the nights in September, an average low-temperature of 5.3°C (41.5°F) is observed.Humidity
In Sarnen, the average relative humidity in September is 82%.Rainfall
The month with the least rainfall is September, when the rain falls for 9.8 days and typically collects 16mm (0.63") of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day in Sarnen is 12h and 33min.On the first day of the month, sunrise is at 06:47 and sunset at 20:06. On the last day of September, in Sarnen, sunrise is at 07:25 and sunset at 19:08 CEST.
Sunshine
The average sunshine in September in Sarnen is 8.7h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 3 during September translates into the following guidance:
Act with care - Obligation to protect against skin and eye damage is highlighted. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sarnen, Switzerland
- Average high temperature in September: 14.8°C
The warmest month (with the highest average high temperature) is August (18.9°C).
The month with the lowest average high temperature is January (-0.6°C).
- Average low temperature in September: 5.3°C
The month with the highest average low temperature is August (8.6°C).
The coldest month (with the lowest average low temperature) is February (-8.3°C).
Average pressure in September
Sarnen, Switzerland
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.5mbar).
Average wind speed in September
Sarnen, Switzerland
- Average wind speed in September: 5.8km/h
The windiest month (with the highest average wind speed) is December (8.1km/h).
The calmest month (with the lowest average wind speed) is August (5.6km/h).
Average humidity in September
Sarnen, Switzerland
- Average humidity in September: 82%
The months with the highest relative humidity are February and March (89%).
The months with the lowest relative humidity are July and August (80%).
Average rainfall in September
Sarnen, Switzerland
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is July (50mm).
The driest month (with the least rainfall) is September (16mm).
Average rainfall days in September
Sarnen, Switzerland
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is May (15.5 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Sarnen, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (192mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Sarnen, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Sarnen, Switzerland
- Average daylight in September: 12h and 36min
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 42min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in September
Sarnen, Switzerland
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is October (20.4 days).
The month with the least sunshine days is July (10.6 days).
Average UV index in September
Sarnen, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January and November (UV index 1).
Average cloud cover in September
Sarnen, Switzerland
- Average cloud cover in September: 38
The months with the most cloud cover are February and May (Cloud cover 48).
The month with the least cloud cover is October (Cloud cover 36).
Average visibility in September
Sarnen, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are April, June, July, August, October, November and December (8km).
The months with the lowest visibility are January, February, March, May and September (7km).
