Monthly Climate
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Best time to visit Köln

August is the best time to visit Köln for general sightseeing, with average highs of 23 °C and about 11 wet days. The comfortable season runs roughly May 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 August comfort 87/100
The least cloud August 61 % average cloud cover
The least rain April 53 mm
Warmth July 23 °C
Cooler weather January 5.2 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 August 87 23 °C 11
2 June 86 21 °C 12
3 July 85 23 °C 13
4 September 82 19 °C 11
5 May 77 18 °C 11
6 April 62 14 °C 10
7 October 60 14 °C 13
8 March 40 10 °C 13
9 November 37 9.2 °C 14
10 February 26 6.5 °C 13
11 January 22 5.2 °C 14
12 December 21 5.9 °C 16

When to think twice

December scores lowest with about 16 wet days and highs near 5.9 °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 5.2 °C 87 mm 73 %
February 6.5 °C 72 mm 71 %
March 10.2 °C 71 mm 67 %
April 14.4 °C 53 mm 62 %
May 18.1 °C 63 mm 65 %
June 21.1 °C 70 mm 64 %
July 23.2 °C 82 mm 62 %
August 23.0 °C 79 mm 61 %
September 19.2 °C 71 mm 63 %
October 14.4 °C 80 mm 69 %
November 9.2 °C 84 mm 76 %
December 5.9 °C 97 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.