Monthly Climate
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Best time to visit Groningen

July is the best time to visit Groningen for general sightseeing, with average highs of 21 °C and about 14 wet days. The comfortable season runs roughly June to September.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking July comfort 80/100
A beach holiday August sea 19 °C
The least cloud April 62 % average cloud cover
The least rain April 48 mm
Warmth July 21 °C
Cooler weather January 4.9 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 July 80 21 °C 14 40
2 August 80 21 °C 14 44
3 June 78 19 °C 12 27
4 September 75 18 °C 12 31
5 May 68 16 °C 11 15
6 October 55 13 °C 12 5
7 April 54 13 °C 11 9
8 March 36 8.7 °C 11 9
9 November 35 8.7 °C 13 5
10 February 25 5.7 °C 10 10
11 December 23 5.6 °C 12 6
12 January 21 4.9 °C 12 5

For a beach holiday

August scores highest, with a sea temperature of 19 °C and air temperatures around 21 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 4.3 °C 4.9 °C 74 % 5
February 3.7 °C 5.7 °C 73 % 10
March 4.8 °C 8.7 °C 69 % 9
April 7.8 °C 13 °C 62 % 9
May 12 °C 16 °C 63 % 15
June 15 °C 19 °C 66 % 27
July 18 °C 21 °C 64 % 40
August 19 °C 21 °C 64 % 44
September 17 °C 18 °C 66 % 31
October 13 °C 13 °C 71 % 5
November 9.4 °C 8.7 °C 76 % 5
December 6.2 °C 5.6 °C 76 % 6

When to think twice

January scores lowest with about 12 wet days and highs near 4.9 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

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: comfort score, beach score, season boundaries. 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.