Climate Overview
The climate in Groningen is hot. The average annual temperature is 27°C and approximately 2109mm of precipitation falls per year. Groningen receives a notable amount of rainfall throughout the year, including during its driest month. Groningen sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Groningen has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is September, when average highs reach 33°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 24°C and an average of 26°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
Groningen is a very wet location, receiving approximately 2109mm of precipitation annually, which averages out to around 176mm per month. The wettest month is June, averaging 359mm of rainfall. May and July also tend to see above-average precipitation. The driest month is September, with just 71mm. That's 288mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Groningen is mildly breezy, with an average annual wind speed of 15km/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 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/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 17km/h in winter, 16km/h in spring, 11km/h in summer, 14km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Groningen, which began on March 20, 2026. Groningen sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in September at around 33°C, while the coldest stretch bottoms out in January near 24°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 24 to 30°C. Rainfall is heavy, totalling around 630mm across the season with a monthly average of 210mm. Winds are moderate at around 16km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 755mm across the season with a monthly average of 252mm. Winds are generally light, averaging 11km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 33°C. Precipitation is moderate at around 283mm for the season, averaging 94mm per month. Winds are generally light, averaging 14km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 30°C. Rainfall is heavy, totalling around 441mm across the season with a monthly average of 147mm. Winds are moderate at around 17km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Groningen 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. 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.
