Climate Insights for Skien

The climate in Skien is cool. The average annual temperature is 7°C and approximately 1124mm of precipitation falls per year. Skien receives a notable amount of rainfall throughout the year, including during its driest month. Skien is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, February, December, when temperatures can drop to -4°C. Snowfall occurs from January to December, with around 183cm accumulating over the season.

Temperatures in Skien vary considerably across the year, with a 24°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 20°C with a mean of 16°C. The coldest month is January, when overnight lows fall to -4°C and the daily average is -2°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between April and May, with a 6°C shift in average temperatures.

Skien is a moderately rainy area, receiving approximately 1124mm of precipitation annually, which averages out to around 94mm per month. The wettest month is September, averaging 136mm of rainfall. November and July also tend to see above-average precipitation. The driest month is April, with just 49mm. That's 87mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 183cm accumulating over the season. January typically sees the most snow at around 46cm.

Skien is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 14km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 16km/h in winter, 15km/h in spring, 14km/h in summer, 16km/h in autumn.

It is currently spring in Skien, which began on March 20, 2026. Skien is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 20°C, while the coldest stretch bottoms out in January near -4°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Skien is during June, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 91mm per month. By contrast, July can be uncomfortably hot with highs reaching 20°C, while January is the coldest period with lows dropping to -4°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Skien based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.