September weather forecastSkien, Norway
September
Weather in September
September in Skien introduces the early signs of autumn. The decreasing temperature, with an average maximum of 14.7°C (58.5°F), heralds fall's imminent arrival. However, sunlight hours remain considerable, allowing ample time for daytime activities. September sees a mix of summer traits and autumnal hues, showcasing an abstract blend of seasonal transition.Temperature
September's arrival aligns with a minor decrease in average high-temperatures, from August's enjoyable 18.7°C (65.7°F) to a moderate 14.7°C (58.5°F). In September, Skien's temperature tends to fall to an average low of 8.8°C (47.8°F) during the night.Humidity
In September, the average relative humidity in Skien is 79%.Rainfall
In Skien, in September, during 13.4 rainfall days, 68mm (2.68") of precipitation is typically accumulated. Throughout the year, in Skien, there are 142.3 rainfall days, and 756mm (29.76") of precipitation is accumulated.Snowfall
In Skien, snow does not fall in June through September.Daylight
In Skien, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 06:19 and sunset at 20:22. On the last day of September, sunrise is at 07:25 and sunset at 18:57 CEST.
Sunshine
In Skien, the average sunshine in September is 7.8h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. When the Sun is at its strongest around midday, find shade and limit exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Skien, Norway
- Average high temperature in September: 14.7°C
The warmest month (with the highest average high temperature) is July (19.7°C).
The month with the lowest average high temperature is January (-0.7°C).
- Average low temperature in September: 8.8°C
The month with the highest average low temperature is July (11.8°C).
The coldest month (with the lowest average low temperature) is February (-4.7°C).
Average pressure in September
Skien, Norway
- Average pressure in September: 1012.7mbar
The month with the highest atmospheric pressure is April (1014.5mbar).
The month with the lowest atmospheric pressure is December (1007.9mbar).
Average wind speed in September
Skien, Norway
- Average wind speed in September: 12.7km/h
The windiest month (with the highest average wind speed) is December (14.5km/h).
The calmest month (with the lowest average wind speed) is August (10.7km/h).
Average humidity in September
Skien, Norway
- Average humidity in September: 79%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is May (69%).
Average rainfall in September
Skien, Norway
- Average rainfall in September: 68mm
The wettest month (with the highest rainfall) is November (85mm).
The driest month (with the least rainfall) is April (29mm).
Average rainfall days in September
Skien, Norway
- Average rainfall days in September: 13.4 days
The months with the highest number of rainy days are July and August (16.7 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in September
Skien, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is January (302mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Skien, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Skien, Norway
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 24min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 7h and 48min
The month with the most sunshine is June (Average sunshine: 11h and 6min).
The months with the least sunshine are January and December (Average sunshine: 3h and 24min).
Average sunshine days in September
Skien, Norway
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is April (17.9 days).
The month with the least sunshine days is July (11.8 days).
Average UV index in September
Skien, Norway
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Skien, Norway
- Average cloud cover in September: 45
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 38).
Average visibility in September
Skien, Norway
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February and March (8km).
