Monthly Climate
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Best time to visit Kumagaya

May is the best time to visit Kumagaya for general sightseeing, with average highs of 22 °C and about 13 wet days.

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 85/100
The least cloud January 37 % average cloud cover
The least rain December 51 mm
Warmth August 30 °C
Cooler weather January 7.7 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 85 22 °C 13
2 October 83 20 °C 13
3 April 74 18 °C 12
4 June 73 25 °C 17
5 September 72 26 °C 16
6 November 71 15 °C 8
7 July 58 29 °C 18
8 August 56 30 °C 15
9 March 53 12 °C 12
10 December 52 10 °C 6
11 February 45 8.8 °C 7
12 January 43 7.7 °C 6

When to think twice

January scores lowest with about 6 wet days and highs near 7.7 °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 7.7 °C 56 mm 37 %
February 8.8 °C 55 mm 45 %
March 12.5 °C 101 mm 54 %
April 17.8 °C 118 mm 59 %
May 22.5 °C 152 mm 68 %
June 25.2 °C 189 mm 81 %
July 28.6 °C 211 mm 78 %
August 29.9 °C 170 mm 70 %
September 26.0 °C 225 mm 70 %
October 20.4 °C 211 mm 61 %
November 15.2 °C 79 mm 47 %
December 10.2 °C 51 mm 37 %

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.