Monthly Climate
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Best time to visit Jōetsu

May is the best time to visit Jōetsu for general sightseeing, with average highs of 21 °C and about 14 wet days. The comfortable season runs roughly May to June. The sea stays above 20 °C from July to October.

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 82/100
A beach holiday July sea 23 °C
The least cloud April 63 % average cloud cover
The least rain April 116 mm
Warmth August 29 °C
Cooler weather January 4.2 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 May 82 21 °C 14 30
2 October 76 20 °C 16 48
3 June 76 24 °C 17 56
4 September 71 25 °C 17 72
5 April 61 15 °C 14 6
6 July 57 28 °C 20 73
7 August 54 29 °C 18 73
8 November 50 14 °C 19 17
9 March 27 8.3 °C 19 0
10 December 23 7.5 °C 23 5
11 February 16 4.7 °C 21 0
12 January 16 4.2 °C 26 0

For a beach holiday

July scores highest, with a sea temperature of 23 °C and air temperatures around 28 °C. The sea is above 20 °C from July to October.

Month Sea Air Sunshine Beach score
January 13 °C 4.2 °C 74 % 0
February 11 °C 4.7 °C 72 % 0
March 10 °C 8.3 °C 68 % 0
April 11 °C 15 °C 63 % 6
May 15 °C 21 °C 66 % 30
June 20 °C 24 °C 78 % 56
July 23 °C 28 °C 77 % 73
August 27 °C 29 °C 67 % 73
September 25 °C 25 °C 72 % 72
October 22 °C 20 °C 67 % 48
November 19 °C 14 °C 66 % 17
December 15 °C 7.5 °C 70 % 5

When to think twice

January scores lowest with about 26 wet days and highs near 4.2 °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 4.2 °C 248 mm 74 %
February 4.7 °C 185 mm 72 %
March 8.3 °C 162 mm 68 %
April 15.1 °C 116 mm 63 %
May 21.0 °C 126 mm 66 %
June 24.3 °C 164 mm 78 %
July 27.7 °C 240 mm 77 %
August 29.2 °C 196 mm 67 %
September 25.2 °C 207 mm 72 %
October 19.5 °C 188 mm 67 %
November 13.7 °C 183 mm 66 %
December 7.5 °C 245 mm 70 %

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.