Climate Insights for Bollnäs

The climate in Bollnäs is cool. The average annual temperature is 5°C and approximately 721mm of precipitation falls per year. Bollnäs receives a notable amount of rainfall throughout the year, including during its driest month. Bollnäs 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 -7°C. Bollnäs experiences heavy snowfall, typically from January through December.

Temperatures in Bollnäs vary considerably across the year, with a 28°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 21°C with a mean of 16°C. The coldest month is January, when overnight lows fall to -7°C and the daily average is -4°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Bollnäs is a relatively dry area, receiving approximately 721mm of precipitation annually, which averages out to around 60mm per month. The wettest month is August, averaging 88mm of rainfall. July and October also tend to see above-average precipitation. The driest month is April, with just 39mm. That's 49mm 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. Bollnäs receives heavy snowfall, accumulating around 214cm annually from January through December. The snowiest month is January, with approximately 42cm. Winter travel should account for significant snow cover.

Bollnäs is relatively calm, with an average annual wind speed of 3km/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 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Bollnäs, which began on June 21, 2026. Bollnäs 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 21°C, while the coldest stretch bottoms out in January near -7°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Bollnäs is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 88mm per month. By contrast, January can be quite cold with temperatures dropping to -7°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 Bollnäs 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.