Monthly Climate
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Best time to visit Isesaki

May is the best time to visit Isesaki for general sightseeing, with average highs of 22 °C and about 12 wet days. The comfortable season runs roughly May to June.

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 May comfort 86/100
The least cloud December 39 % average cloud cover
The least rain December 46 mm
Warmth August 29 °C
Cooler weather January 6.6 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 86 22 °C 12
2 October 81 19 °C 12
3 June 77 24 °C 17
4 September 76 25 °C 16
5 April 72 17 °C 11
6 November 67 14 °C 7
7 July 63 28 °C 17
8 August 61 29 °C 16
9 March 49 11 °C 11
10 December 49 9.3 °C 6
11 February 40 7.6 °C 7
12 January 39 6.6 °C 6

When to think twice

January scores lowest with about 6 wet days and highs near 6.6 °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 6.6 °C 54 mm 40 %
February 7.6 °C 54 mm 46 %
March 11.4 °C 96 mm 54 %
April 16.9 °C 108 mm 58 %
May 21.6 °C 133 mm 66 %
June 24.1 °C 178 mm 79 %
July 27.5 °C 194 mm 77 %
August 28.6 °C 155 mm 69 %
September 24.7 °C 205 mm 69 %
October 19.3 °C 186 mm 60 %
November 14.2 °C 66 mm 47 %
December 9.3 °C 46 mm 39 %

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.