Monthly Climate
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Best time to visit Kumamoto

October is the best time to visit Kumamoto for general sightseeing, with average highs of 23 °C and about 8 wet days. The sea stays above 20 °C from June 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 91/100
A beach holiday September sea 26 °C
The least cloud October 50 % average cloud cover
The least rain January 79 mm
Warmth August 30 °C
Cooler weather January 9.0 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 91 23 °C 8 77
2 May 86 23 °C 11 57
3 April 81 19 °C 12 31
4 November 78 17 °C 9 44
5 September 72 28 °C 11 83
6 June 69 26 °C 17 68
7 March 61 14 °C 13 5
8 August 55 30 °C 14 72
9 July 55 29 °C 16 74
10 December 54 11 °C 10 21
11 February 51 10 °C 10 11
12 January 45 9.0 °C 10 12

For a beach holiday

September scores highest, with a sea temperature of 26 °C and air temperatures around 28 °C. The sea is above 20 °C from June to October.

Month Sea Air Sunshine Beach score
January 14 °C 9.0 °C 62 % 12
February 13 °C 10 °C 61 % 11
March 14 °C 14 °C 62 % 5
April 16 °C 19 °C 63 % 31
May 19 °C 23 °C 68 % 57
June 22 °C 26 °C 81 % 68
July 25 °C 29 °C 71 % 74
August 27 °C 30 °C 61 % 72
September 26 °C 28 °C 59 % 83
October 23 °C 23 °C 50 % 77
November 20 °C 17 °C 52 % 44
December 17 °C 11 °C 56 % 21

When to think twice

January scores lowest with about 10 wet days and highs near 9.0 °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 9.0 °C 79 mm 62 %
February 10.5 °C 101 mm 61 %
March 14.0 °C 140 mm 62 %
April 18.9 °C 158 mm 63 %
May 23.3 °C 174 mm 68 %
June 25.8 °C 416 mm 81 %
July 29.1 °C 305 mm 71 %
August 30.5 °C 141 mm 61 %
September 27.6 °C 167 mm 59 %
October 22.7 °C 97 mm 50 %
November 16.9 °C 92 mm 52 %
December 11.2 °C 82 mm 56 %

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.