Monthly Climate
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Best time to visit Hitachi

October is the best time to visit Hitachi for general sightseeing, with average highs of 19 °C and about 13 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 October comfort 81/100
A beach holiday August sea 24 °C
The least cloud January 40 % average cloud cover
The least rain December 64 mm
Warmth August 27 °C
Cooler weather January 7.1 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 81 19 °C 13 48
2 May 80 19 °C 13 32
3 June 78 22 °C 16 47
4 September 75 24 °C 15 68
5 November 70 15 °C 9 31
6 July 68 26 °C 16 66
7 August 66 27 °C 13 78
8 April 66 15 °C 12 12
9 December 51 9.5 °C 8 24
10 March 47 11 °C 13 5
11 January 42 7.1 °C 7 18
12 February 41 7.6 °C 8 14

For a beach holiday

August scores highest, with a sea temperature of 24 °C and air temperatures around 27 °C. The sea is above 20 °C from July to October.

Month Sea Air Sunshine Beach score
January 14 °C 7.1 °C 40 % 18
February 13 °C 7.6 °C 48 % 14
March 13 °C 11 °C 57 % 5
April 14 °C 15 °C 61 % 12
May 17 °C 19 °C 69 % 32
June 19 °C 22 °C 80 % 47
July 22 °C 26 °C 78 % 66
August 24 °C 27 °C 69 % 78
September 23 °C 24 °C 69 % 68
October 21 °C 19 °C 62 % 48
November 19 °C 15 °C 51 % 31
December 16 °C 9.5 °C 40 % 24

When to think twice

February scores lowest with about 8 wet days and highs near 7.6 °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 7.1 °C 65 mm 40 %
February 7.6 °C 65 mm 48 %
March 10.6 °C 116 mm 57 %
April 15.2 °C 123 mm 61 %
May 19.3 °C 150 mm 69 %
June 22.1 °C 158 mm 80 %
July 25.6 °C 178 mm 78 %
August 27.0 °C 131 mm 69 %
September 24.1 °C 188 mm 69 %
October 19.4 °C 197 mm 62 %
November 14.6 °C 96 mm 51 %
December 9.5 °C 64 mm 40 %

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.