Climate Insights for Bollnäs

The climate in Bollnäs is cool. The average annual temperature is 6°C and approximately 726mm 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, December, when temperatures can drop to -7°C. Snowfall occurs from January to December, with around 188cm accumulating over the season.

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 April and May, with a 6°C shift in average temperatures.

Bollnäs is a relatively dry area, receiving approximately 726mm of precipitation annually, which averages out to around 60mm per month. The wettest month is July, averaging 107mm of rainfall. August and June also tend to see above-average precipitation. The driest month is March, with just 35mm. That's 71mm less than July, 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 188cm accumulating over the season. January typically sees the most snow at around 49cm.

Bollnäs is relatively calm, with an average annual wind speed of 12km/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 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap 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 13km/h in winter, 11km/h in spring, 10km/h in summer, 12km/h in autumn.

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 (7 days from now).

The best time to visit Bollnäs is during June, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 70mm per month. By contrast, July can be uncomfortably hot with highs reaching 21°C, while January is the coldest period with lows 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.