September weather forecastBollnäs, Sweden
September
Weather in September
September, the first month of the autumn in Bollnäs, is also a moderate month, with an average temperature fluctuating between 14.5°C (58.1°F) and 6.9°C (44.4°F).Temperature
September reveals a small adjustment in temperature, transitioning from an average high of an enjoyable 19.3°C (66.7°F) in August to a still refreshing 14.5°C (58.1°F). During the nights in September, Bollnäs experiences a consistent average temperature of 6.9°C (44.4°F).Humidity
In Bollnäs, the average relative humidity in September is 81%.Rainfall
In Bollnäs, Sweden, in September, during 10.7 rainfall days, 23mm (0.91") of precipitation is typically accumulated. Throughout the year, there are 122.8 rainfall days, and 298mm (11.73") of precipitation is accumulated.Snowfall
In Bollnäs, snow does not fall in June through September.Daylight
The average length of the day in September in Bollnäs is 12h and 55min.On the first day of the month, sunrise is at 05:47 and sunset at 20:01. On the last day of September, sunrise is at 06:59 and sunset at 18:28 CEST.
Sunshine
In Bollnäs, the average sunshine in September is 7.2h.UV index
The average daily maximum UV index in September in Bollnäs is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Exercise prevention - Protecting skin and eyes from harm is required. To avoid the Sun's strongest rays, limit exposure around the mid-day period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bollnäs, Sweden
- Average high temperature in September: 14.5°C
The warmest month (with the highest average high temperature) is July (20.8°C).
The month with the lowest average high temperature is January (-3°C).
- Average low temperature in September: 6.9°C
The month with the highest average low temperature is July (11.2°C).
The coldest month (with the lowest average low temperature) is January (-7.2°C).
Average pressure in September
Bollnäs, Sweden
- Average pressure in September: 1012.4mbar
The month with the highest atmospheric pressure is May (1014.4mbar).
The month with the lowest atmospheric pressure is December (1006.5mbar).
Average wind speed in September
Bollnäs, Sweden
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is December (11km/h).
The calmest month (with the lowest average wind speed) is August (8.8km/h).
Average humidity in September
Bollnäs, Sweden
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is May (67%).
Average rainfall in September
Bollnäs, Sweden
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is July (43mm).
The driest month (with the least rainfall) is April (13mm).
Average rainfall days in September
Bollnäs, Sweden
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Bollnäs, Sweden
- Average snowfall in September: 0mm
The month with the highest snowfall is March (120mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Bollnäs, Sweden
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (14.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bollnäs, Sweden
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 19h and 18min).
The month with the shortest days is December (Average daylight: 5h and 36min).
- Average sunshine in September: 7h and 12min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in September
Bollnäs, Sweden
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is September (15.9 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Bollnäs, Sweden
- 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 1).
Average cloud cover in September
Bollnäs, Sweden
- Average cloud cover in September: 53
The month with the most cloud cover is February (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 45).
Average visibility in September
Bollnäs, Sweden
- Average visibility in September: 8km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January, February and March (6km).
