Monthly Climate
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Best time to visit Hachiōji

May is the best time to visit Hachiōji for general sightseeing, with average highs of 21 °C and about 15 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 80/100
The least cloud January 39 % average cloud cover
The least rain December 67 mm
Warmth August 29 °C
Cooler weather January 7.8 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 80 21 °C 15
2 October 79 20 °C 15
3 June 71 24 °C 20
4 September 71 25 °C 18
5 April 69 17 °C 14
6 November 66 15 °C 10
7 July 57 28 °C 21
8 August 54 29 °C 19
9 December 49 10 °C 8
10 March 47 12 °C 15
11 February 39 8.6 °C 10
12 January 38 7.8 °C 8

When to think twice

January scores lowest with about 8 wet days and highs near 7.8 °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 7.8 °C 77 mm 39 %
February 8.6 °C 78 mm 49 %
March 12.0 °C 134 mm 59 %
April 17.1 °C 144 mm 63 %
May 21.4 °C 165 mm 71 %
June 24.1 °C 223 mm 83 %
July 27.7 °C 232 mm 78 %
August 28.8 °C 199 mm 69 %
September 25.2 °C 250 mm 71 %
October 19.9 °C 236 mm 65 %
November 15.1 °C 98 mm 52 %
December 10.3 °C 67 mm 41 %

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.