Monthly Climate
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Best time to visit Grenoble

September is the best time to visit Grenoble for general sightseeing, with average highs of 22 °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 September comfort 86/100
The least cloud July 47 % average cloud cover
The least rain February 100 mm
Warmth August 26 °C
Cooler weather January 7.2 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 September 86 22 °C 11
2 June 82 24 °C 15
3 August 81 26 °C 11
4 July 80 26 °C 12
5 May 77 20 °C 16
6 October 73 18 °C 12
7 April 64 16 °C 14
8 March 51 12 °C 13
9 November 46 11 °C 13
10 February 36 8.2 °C 11
11 December 31 7.8 °C 13
12 January 29 7.2 °C 13

When to think twice

January scores lowest with about 13 wet days and highs near 7.2 °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 7.2 °C 116 mm 65 %
February 8.2 °C 100 mm 61 %
March 12.3 °C 107 mm 58 %
April 16.1 °C 120 mm 62 %
May 20.2 °C 145 mm 64 %
June 23.9 °C 124 mm 57 %
July 26.3 °C 111 mm 47 %
August 26.3 °C 108 mm 49 %
September 21.9 °C 108 mm 57 %
October 17.8 °C 118 mm 64 %
November 11.5 °C 143 mm 67 %
December 7.8 °C 130 mm 66 %

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.