Groningen climate
Groningen is warmest in July, with average highs of 21 °C, and coldest in February, when nights average 0.7 °C. July is the wettest month (87 mm) and April the driest (48 mm). Figures are 1991–2020 climate normals.
Across a full year Groningen averages 775 mm of rain, 13 days above 25 °C and 47 days below freezing.
The Netherlands · population 244,807 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month July 21 °C
- Coldest month February 0.7 °C
- Driest month April 48 mm
- Wettest month July 87 mm
- Least cloud April 62 % cloud
- Hottest on record July 35 °C
- Coldest on record March -18 °C
- Warmest sea August 19 °C
What to expectGroningen through the year
Groningen has a clear annual cycle: average daily highs run from 5.7 °C in February to 21 °C in July, a swing of 15 °C in mean temperature across the year.
Counted across a normal year, 13 days a year reach 25 °C, 1 of them reach 30 °C, 47 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in July.
Rain is spread fairly evenly through the year, from 48 mm in April to 87 mm in July. There is no dry season to aim for.
The sea off Groningen is warmest in August at 19 °C and coldest in February at 3.7 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 4.9 °C | 65 mm | 74 % |
| February | 5.7 °C | 51 mm | 73 % |
| March | 8.7 °C | 50 mm | 69 % |
| April | 12.8 °C | 48 mm | 62 % |
| May | 16.2 °C | 61 mm | 63 % |
| June | 18.8 °C | 74 mm | 66 % |
| July | 21.0 °C | 87 mm | 64 % |
| August | 21.0 °C | 85 mm | 64 % |
| September | 17.8 °C | 68 mm | 66 % |
| October | 13.5 °C | 64 mm | 71 % |
| November | 8.7 °C | 58 mm | 76 % |
| December | 5.6 °C | 64 mm | 76 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 4.9 °C | 0.7 °C | 2.8 °C | 13.9 °C | -18.2 °C | 0 | 0 | 12 |
| February | 5.7 °C | 0.7 °C | 3.1 °C | 15.6 °C | -14.3 °C | 0 | 0 | 12 |
| March | 8.7 °C | 2.2 °C | 5.4 °C | 20.8 °C | -18.5 °C | 0 | 0 | 7 |
| April | 12.8 °C | 4.9 °C | 8.9 °C | 25.6 °C | -4.0 °C | 0 | 0 | 2 |
| May | 16.2 °C | 8.6 °C | 12.5 °C | 28.5 °C | 0.8 °C | 1 | 0 | 0 |
| June | 18.8 °C | 11.5 °C | 15.3 °C | 32.1 °C | 4.9 °C | 2 | 0 | 0 |
| July | 21.0 °C | 13.8 °C | 17.5 °C | 34.7 °C | 8.1 °C | 5 | 0 | 0 |
| August | 21.0 °C | 13.9 °C | 17.5 °C | 34.0 °C | 7.0 °C | 4 | 1 | 0 |
| September | 17.8 °C | 11.5 °C | 14.6 °C | 28.7 °C | 3.8 °C | 1 | 0 | 0 |
| October | 13.5 °C | 8.1 °C | 10.7 °C | 25.2 °C | -4.5 °C | 0 | 0 | 1 |
| November | 8.7 °C | 4.4 °C | 6.5 °C | 18.0 °C | -7.5 °C | 0 | 0 | 3 |
| December | 5.6 °C | 1.7 °C | 3.7 °C | 13.9 °C | -14.5 °C | 0 | 0 | 10 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind | Sea temp |
|---|---|---|---|---|---|---|---|
| January | 65 mm | 12 | 8.1 h/day | 74 % | 85 % | 26 km/h | 4.3 °C |
| February | 51 mm | 10 | 9.8 h/day | 73 % | 83 % | 25 km/h | 3.7 °C |
| March | 50 mm | 11 | 12 h/day | 69 % | 80 % | 24 km/h | 4.8 °C |
| April | 48 mm | 11 | 14 h/day | 62 % | 76 % | 21 km/h | 7.8 °C |
| May | 61 mm | 11 | 16 h/day | 63 % | 75 % | 21 km/h | 11.5 °C |
| June | 74 mm | 12 | 17 h/day | 66 % | 77 % | 20 km/h | 15.0 °C |
| July | 87 mm | 14 | 16 h/day | 64 % | 78 % | 20 km/h | 17.7 °C |
| August | 85 mm | 14 | 15 h/day | 64 % | 78 % | 20 km/h | 19.0 °C |
| September | 68 mm | 12 | 13 h/day | 66 % | 80 % | 21 km/h | 16.9 °C |
| October | 64 mm | 12 | 11 h/day | 71 % | 83 % | 23 km/h | 13.2 °C |
| November | 58 mm | 13 | 8.7 h/day | 76 % | 87 % | 23 km/h | 9.4 °C |
| December | 64 mm | 12 | 7.6 h/day | 76 % | 87 % | 25 km/h | 6.2 °C |
Planning a trip? See the best time to visit Groningen.
QuestionsCommon questions about Groningen’s climate
When is the best time to visit Groningen?
That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and April the driest. The month-by-month table above has the full picture.
How hot does Groningen get?
In July, the warmest month, daily highs average 21 °C. About 1 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.
How cold does it get in winter?
Nights average 0.7 °C in February, the coldest month. A normal year has 47 nights below freezing.
Which month is wettest in Groningen?
July, averaging 87 mm over 14 days with rain. The driest month is April with 48 mm. The year as a whole averages 775 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Groningen rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.