September weather forecastSumiswald, Switzerland
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Sumiswald, Switzerland, with an average temperature ranging between max 18.3°C (64.9°F) and min 7.5°C (45.5°F).Temperature
Sumiswald's progression into September involves a gentle drop in the average high-temperature, from an agreeable 22.3°C (72.1°F) in August to a refreshing 18.3°C (64.9°F). In Sumiswald, September's nights observe an average temperature dip to a frosty 7.5°C (45.5°F).Humidity
In Sumiswald, the average relative humidity in September is 81%.Rainfall
September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 37mm (1.46") of precipitation.Snowfall
In Sumiswald, snow does not fall in June through September.Daylight
In Sumiswald, the average length of the day in September is 12h and 34min.On the first day of September in Sumiswald, sunrise is at 06:49 and sunset at 20:08. On the last day of the month, sunrise is at 07:27 and sunset at 19:10 CEST.
Sunshine
In September, the average sunshine in Sumiswald, Switzerland, is 8.8h.UV index
In Sumiswald, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sumiswald, Switzerland
- Average high temperature in September: 18.3°C
The warmest month (with the highest average high temperature) is July (22.5°C).
The month with the lowest average high temperature is January (2.3°C).
- Average low temperature in September: 7.5°C
The month with the highest average low temperature is July (11.4°C).
The coldest month (with the lowest average low temperature) is February (-4.3°C).
Average pressure in September
Sumiswald, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
Sumiswald, Switzerland
- Average wind speed in September: 6.5km/h
The windiest month (with the highest average wind speed) is March (8.6km/h).
The calmest month (with the lowest average wind speed) is August (6.1km/h).
Average humidity in September
Sumiswald, Switzerland
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (77%).
Average rainfall in September
Sumiswald, Switzerland
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is June (99mm).
The driest month (with the least rainfall) is September (37mm).
Average rainfall days in September
Sumiswald, Switzerland
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is February (8.4 days).
Average snowfall in September
Sumiswald, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (269mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Sumiswald, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Sumiswald, 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 48min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Sumiswald, Switzerland
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is October (17.4 days).
The month with the least sunshine days is June (8.3 days).
Average UV index in September
Sumiswald, 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, October, November and December (UV index 2).
Average cloud cover in September
Sumiswald, Switzerland
- Average cloud cover in September: 35
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Sumiswald, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (8km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (8km).
