Monthly Climate
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Best time to visit Basel

June is the best time to visit Basel for general sightseeing, with average highs of 22 °C and about 15 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 June comfort 82/100
The least cloud July 54 % average cloud cover
The least rain February 72 mm
Warmth July 25 °C
Cooler weather January 5.4 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 June 82 22 °C 15
2 September 82 20 °C 12
3 July 82 25 °C 15
4 August 82 25 °C 15
5 May 72 19 °C 16
6 October 62 15 °C 13
7 April 59 15 °C 14
8 March 44 11 °C 13
9 November 37 9.3 °C 13
10 February 29 6.9 °C 11
11 January 23 5.4 °C 13
12 December 23 5.8 °C 14

When to think twice

December scores lowest with about 14 wet days and highs near 5.8 °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 5.4 °C 78 mm 70 %
February 6.9 °C 72 mm 66 %
March 11.1 °C 82 mm 62 %
April 15.0 °C 90 mm 63 %
May 18.7 °C 126 mm 65 %
June 22.4 °C 113 mm 60 %
July 24.6 °C 118 mm 54 %
August 24.5 °C 122 mm 55 %
September 20.0 °C 94 mm 61 %
October 15.3 °C 96 mm 70 %
November 9.3 °C 93 mm 74 %
December 5.8 °C 98 mm 72 %

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.