September weather forecast
Skien, Norway

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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.

Frequently asked questions

What is the average September temperature in Skien?

During September, Skien experiences an average high-temperature of 14.7°C (58.5°F) and a low-temperature of 8.8°C (47.8°F).

What is the average humidity in September in Skien?

In Skien, Norway, the average relative humidity in September is 79%.

How much does it rain in Skien in September?

In Skien, during September, the rain falls for 13.4 days and regularly aggregates up to 68mm (2.68") of precipitation.

When it does not snow in Skien?

In Skien, snow does not fall in June through September.

Does it snow in Skien in September?

In Skien, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Skien have in September?

The average day length in September is 12h and 50min.

When is the sunrise / sunset in September in Skien?

On the first day of September in Skien, sunrise is at 06:19 and sunset at 20:22. On the last day of the month, sunrise is at 07:25 and sunset at 18:57 CEST.

How many hours of sunshine does Skien have in September?

The average sunshine duration in September is 7.8h.

How high is the UV index in September in Skien?

The average daily maximum UV index in September in Skien is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Skien, Norway

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Skien, Norway
  • Average daylight in September: 12h and 5min

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 5min

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 - 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 - 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 - 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 - 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).

Skien, Norway

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