September weather forecastInterlaken, Switzerland
September
Weather in September
As September rolls around, Interlaken begins its transition from summer towards autumn. Despite a dip in temperature to 12.7°C (54.9°F) from August's 17°C (62.6°F), the weather remains generally pleasant. The decrease in daylight hours and slight increase in rainfall signal the onset of fall. The city turns into a palette of vibrant hues as trees begin to change color from green to brilliant shades of yellow, orange, and red. In September, nature lovers will delight in the changing scenery that accompanies the arrival of autumn.Temperature
September in Interlaken, Switzerland, is marked by a subtle drop in average high-temperatures, transitioning from an enjoyable 17°C (62.6°F) in August to a fresh 12.7°C (54.9°F). Interlaken throughout September, experiences an average nighttime temperature of 4.1°C (39.4°F).Humidity
The average relative humidity in September is 84%.Rainfall
In September, the rain falls for 16.8 days. Throughout September, 53mm (2.09") of precipitation is accumulated. In Interlaken, during the entire year, the rain falls for 192.3 days and collects up to 935mm (36.81") of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September in Interlaken is 12h and 33min.On the first day of the month, sunrise is at 06:49 and sunset at 20:07. On the last day of September, sunrise is at 07:26 and sunset at 19:10 CEST.
Sunshine
In September, the average sunshine is 8.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A typical high UV index of 3 in September suggests the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Interlaken, Switzerland
- Average high temperature in September: 12.7°C
The warmest month (with the highest average high temperature) is July (17.1°C).
The month with the lowest average high temperature is January (-1.8°C).
- Average low temperature in September: 4.1°C
The months with the highest average low temperature are July and August (7.3°C).
The coldest month (with the lowest average low temperature) is February (-10°C).
Average pressure in September
Interlaken, Switzerland
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Interlaken, Switzerland
- Average wind speed in September: 6.1km/h
The windiest month (with the highest average wind speed) is December (8.3km/h).
The calmest month (with the lowest average wind speed) is August (5.8km/h).
Average humidity in September
Interlaken, Switzerland
- Average humidity in September: 84%
The months with the highest relative humidity are February and March (90%).
The months with the lowest relative humidity are July and August (81%).
Average rainfall in September
Interlaken, Switzerland
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is August (118mm).
The driest months (with the least rainfall) are January and February (50mm).
Average rainfall days in September
Interlaken, Switzerland
- Average rainfall days in September: 16.8 days
The month with the highest number of rainy days is July (22.5 days).
The month with the least rainy days is February (8.8 days).
Average snowfall in September
Interlaken, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (211mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Interlaken, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Interlaken, 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 6min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days in September
Interlaken, Switzerland
- Average sunshine days in September: 11 days
The month with the most sunshine days is October (15 days).
The month with the least sunshine days is July (5.7 days).
Average UV index in September
Interlaken, 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, November and December (UV index 1).
Average cloud cover in September
Interlaken, Switzerland
- Average cloud cover in September: 44
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is October (Cloud cover 41).
Average visibility in September
Interlaken, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are July, August, October, November and December (8km).
The months with the lowest visibility are January, February, March, April, May, June and September (7km).
