Climate Overview
The climate in Rjukan is cool. The average annual temperature is 4°C and approximately 1268mm of precipitation falls per year. Rjukan receives a notable amount of rainfall throughout the year, including during its driest month. Rjukan 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, March, when temperatures can drop to -8°C. Rjukan experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Rjukan vary considerably across the year, with a 26°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 18°C with a mean of 14°C. The coldest month is January, when overnight lows fall to -8°C and the daily average is -5°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.
Precipitation
Rjukan is a fairly wet location, receiving approximately 1268mm of precipitation annually, which averages out to around 106mm per month. The wettest month is September, averaging 142mm of rainfall. October and June also tend to see above-average precipitation. The driest month is April, with just 61mm. That's 81mm less than September, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Rjukan receives heavy snowfall, accumulating around 502cm annually from January through December. The snowiest month is December, with approximately 104cm. Winter travel should account for significant snow cover.
Wind
Rjukan is relatively calm, with an average annual wind speed of 2km/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 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.
Seasons
88 days until Autumn
It is currently summer in Rjukan, which began on June 21, 2026. Rjukan 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 18°C, while the coldest stretch bottoms out in January near -8°C. Autumn is next, beginning on September 23, 2026 — 88 days from now.
Spring
Temperatures range from -6 to 13°C. Precipitation is moderate at around 221mm for the season, averaging 74mm per month. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 7 to 18°C. Rainfall is heavy, totalling around 367mm across the season with a monthly average of 122mm. Winds are generally light, averaging 2km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -4 to 12°C. Rainfall is heavy, totalling around 397mm across the season with a monthly average of 132mm. Expect around 118cm of snow accumulation during this period. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -8 to -1°C. Precipitation is moderate at around 283mm for the season, averaging 94mm per month. Expect around 258cm of snow accumulation during this period. Winds are generally light, averaging 2km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Monthly Climate Data
The table below shows monthly climate averages for Rjukan 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.
