Monthly Climate
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Best time to visit Hakodate

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

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 September comfort 81/100
A beach holiday August sea 23 °C
The least cloud October 56 % average cloud cover
The least rain January 49 mm
Warmth August 24 °C
Cooler weather January -0.5 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 September 81 21 °C 12 61
2 July 79 22 °C 13 49
3 June 77 18 °C 10 25
4 August 76 24 °C 13 68
5 October 67 15 °C 12 30
6 May 59 14 °C 11 7
7 April 40 8.9 °C 10 11
8 November 36 8.0 °C 12 12
9 February 28 0.00 °C 8 15
10 January 27 -0.5 °C 8 14
11 March 25 3.6 °C 10 11
12 December 25 1.9 °C 10 10

For a beach holiday

August scores highest, with a sea temperature of 23 °C and air temperatures around 24 °C. The sea is above 20 °C from August to September.

Month Sea Air Sunshine Beach score
January 9.7 °C -0.5 °C 66 % 14
February 7.5 °C 0.00 °C 65 % 15
March 7.5 °C 3.6 °C 59 % 11
April 8.7 °C 8.9 °C 59 % 11
May 11 °C 14 °C 66 % 7
June 15 °C 18 °C 73 % 25
July 19 °C 22 °C 79 % 49
August 23 °C 24 °C 73 % 68
September 22 °C 21 °C 64 % 61
October 19 °C 15 °C 56 % 30
November 15 °C 8.0 °C 61 % 12
December 13 °C 1.9 °C 65 % 10

When to think twice

December scores lowest with about 10 wet days and highs near 1.9 °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 -0.5 °C 49 mm 66 %
February 0.0 °C 51 mm 65 %
March 3.6 °C 66 mm 59 %
April 8.9 °C 77 mm 59 %
May 14.0 °C 99 mm 66 %
June 17.9 °C 92 mm 73 %
July 21.7 °C 140 mm 79 %
August 23.8 °C 179 mm 73 %
September 21.3 °C 160 mm 64 %
October 15.2 °C 107 mm 56 %
November 8.0 °C 87 mm 61 %
December 1.9 °C 68 mm 65 %

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.