Climate Insights for Tromsø

The climate in Tromsø is cold. The average annual temperature is 2°C and approximately 1449mm of precipitation falls per year. Tromsø receives a notable amount of rainfall throughout the year, including during its driest month. Tromsø is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, March, when temperatures can drop to -9°C. Tromsø experiences heavy snowfall, typically from January through December.

Temperatures in Tromsø 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 15°C with a mean of 13°C. The coldest month is January, when overnight lows fall to -9°C and the daily average is -7°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Tromsø is a fairly wet location, receiving approximately 1449mm of precipitation annually, which averages out to around 121mm per month. The wettest month is August, averaging 162mm of rainfall. June and September also tend to see above-average precipitation. The driest month is October, with just 84mm. That's 78mm less than August, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Tromsø receives heavy snowfall, accumulating around 674cm annually from January through December. The snowiest month is March, with approximately 126cm. Winter travel should account for significant snow cover.

Tromsø 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 July, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 0km/h gap between the calmest and windiest months.

It is currently summer in Tromsø, which began on June 21, 2026. Tromsø 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 15°C, while the coldest stretch bottoms out in January near -9°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The table below shows monthly climate averages for Tromsø 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.