Climate Insights for Grimstad

The climate in Grimstad is cool. The average annual temperature is 8°C and approximately 1362mm of precipitation falls per year. Grimstad receives a notable amount of rainfall throughout the year, including during its driest month. Grimstad 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 February, January, March, when temperatures can drop to -2°C. Grimstad experiences heavy snowfall, typically from January through December.

Temperatures in Grimstad vary considerably across the year, with a 23°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 21°C with a mean of 17°C. The coldest month is February, when overnight lows fall to -2°C and the daily average is 0°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between April and May, with a 5°C shift in average temperatures.

Grimstad is a fairly wet location, receiving approximately 1362mm of precipitation annually, which averages out to around 114mm per month. The wettest month is October, averaging 154mm of rainfall. December and September also tend to see above-average precipitation. The driest month is April, with just 61mm. That's 93mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Grimstad receives heavy snowfall, accumulating around 256cm annually from January through December. The snowiest month is January, with approximately 68cm. Winter travel should account for significant snow cover.

Grimstad is relatively calm, with an average annual wind speed of 4km/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 August, 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 Grimstad, which began on June 21, 2026. Grimstad 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 February near -2°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The table below shows monthly climate averages for Grimstad 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.