Climate Insights for Mosfellsbær

The climate in Mosfellsbær is cool. The average annual temperature is 4°C and approximately 1359mm of precipitation falls per year. Mosfellsbær receives a notable amount of rainfall throughout the year, including during its driest month. Mosfellsbær 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, December, February, when temperatures can drop to -5°C. Mosfellsbær experiences heavy snowfall, typically from January through December.

Mosfellsbær sees moderate temperature variation throughout the year, ranging from -5°C to 14°C. July is the warmest month, though highs remain moderate at 14°C with a mean of 11°C. The coldest month is January, when overnight lows fall to -5°C and the daily average is -3°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between March and April, with a 4°C shift in average temperatures.

Mosfellsbær is a fairly wet location, receiving approximately 1359mm of precipitation annually, which averages out to around 113mm per month. The wettest month is January, averaging 142mm of rainfall. February and September also tend to see above-average precipitation. The driest month is July, with just 72mm. That's 69mm less than January, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Mosfellsbær receives heavy snowfall, accumulating around 246cm annually from January through December. The snowiest month is January, with approximately 53cm. Winter travel should account for significant snow cover.

Mosfellsbær is mildly breezy, with an average annual wind speed of 18km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 15km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h 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 19km/h in winter, 18km/h in spring, 16km/h in summer, 18km/h in autumn.

It is currently spring in Mosfellsbær, which began on March 20, 2026. Mosfellsbær 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 14°C, while the coldest stretch bottoms out in January near -5°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The table below shows monthly climate averages for Mosfellsbær 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.