Monthly Climate
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Best time to visit Yokosuka

October is the best time to visit Yokosuka for general sightseeing, with average highs of 21 °C and about 12 wet days. The comfortable season runs roughly May to June. The sea stays above 20 °C from June to November.

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 October comfort 80/100
A beach holiday August sea 26 °C
The least cloud January 43 % average cloud cover
The least rain December 65 mm
Warmth August 27 °C
Cooler weather January 9.1 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 80 21 °C 12 61
2 May 79 20 °C 11 46
3 June 74 23 °C 14 59
4 November 74 16 °C 9 44
5 September 69 25 °C 13 75
6 April 68 16 °C 11 25
7 July 66 26 °C 12 79
8 August 62 27 °C 11 84
9 December 59 12 °C 7 33
10 March 52 12 °C 12 12
11 January 49 9.1 °C 7 26
12 February 47 9.5 °C 9 18

For a beach holiday

August scores highest, with a sea temperature of 26 °C and air temperatures around 27 °C. The sea is above 20 °C from June to November.

Month Sea Air Sunshine Beach score
January 16 °C 9.1 °C 43 % 26
February 15 °C 9.5 °C 51 % 18
March 16 °C 12 °C 59 % 12
April 17 °C 16 °C 62 % 25
May 19 °C 20 °C 68 % 46
June 21 °C 23 °C 80 % 59
July 24 °C 26 °C 73 % 79
August 26 °C 27 °C 62 % 84
September 25 °C 25 °C 65 % 75
October 23 °C 21 °C 61 % 61
November 21 °C 16 °C 54 % 44
December 18 °C 12 °C 45 % 33

When to think twice

February scores lowest with about 9 wet days and highs near 9.5 °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 9.1 °C 75 mm 43 %
February 9.5 °C 75 mm 51 %
March 12.2 °C 128 mm 59 %
April 16.1 °C 118 mm 62 %
May 19.8 °C 131 mm 68 %
June 22.6 °C 175 mm 80 %
July 25.8 °C 147 mm 73 %
August 27.4 °C 104 mm 62 %
September 25.1 °C 191 mm 65 %
October 20.6 °C 210 mm 61 %
November 16.1 °C 97 mm 54 %
December 11.6 °C 65 mm 45 %

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.