Climate Insights for Harstad

The climate in Harstad is cool. The average annual temperature is 4°C and approximately 1257mm of precipitation falls per year. Harstad receives a notable amount of rainfall throughout the year, including during its driest month. Harstad 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, December, when temperatures can drop to -8°C. Harstad experiences heavy snowfall, typically from January through December.

Temperatures in Harstad 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 16°C with a mean of 13°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 5°C between highs and lows. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Harstad is a fairly wet location, receiving approximately 1257mm of precipitation annually, which averages out to around 105mm per month. The wettest month is December, averaging 119mm of rainfall. January and August also tend to see above-average precipitation. The driest month is April, with just 81mm. That's 38mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Harstad receives heavy snowfall, accumulating around 331cm annually from January through December. The snowiest month is March, with approximately 60cm. Winter travel should account for significant snow cover.

Harstad is mildly breezy, with an average annual wind speed of 14km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 12km/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.

It is currently spring in Harstad, which began on March 20, 2026. Harstad 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 16°C, while the coldest stretch bottoms out in January near -8°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Harstad 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.