Monthly Climate
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Best time to visit Nagasaki

October is the best time to visit Nagasaki for general sightseeing, with average highs of 22 °C and about 7 wet days. The comfortable season runs roughly October to November. 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 90/100
A beach holiday September sea 27 °C
The least cloud October 46 % average cloud cover
The least rain January 80 mm
Warmth August 29 °C
Cooler weather January 9.7 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 90 22 °C 7 78
2 May 84 21 °C 11 55
3 November 80 17 °C 9 51
4 April 76 18 °C 11 33
5 September 69 27 °C 12 81
6 June 69 24 °C 17 66
7 March 60 13 °C 12 14
8 December 57 12 °C 11 27
9 July 54 28 °C 17 75
10 August 54 29 °C 14 74
11 February 52 11 °C 10 17
12 January 48 9.7 °C 10 20

For a beach holiday

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

Month Sea Air Sunshine Beach score
January 17 °C 9.7 °C 68 % 20
February 16 °C 11 °C 64 % 17
March 16 °C 13 °C 62 % 14
April 17 °C 18 °C 62 % 33
May 20 °C 21 °C 66 % 55
June 22 °C 24 °C 79 % 66
July 25 °C 28 °C 69 % 75
August 28 °C 29 °C 59 % 74
September 27 °C 27 °C 55 % 81
October 24 °C 22 °C 46 % 78
November 21 °C 17 °C 52 % 51
December 19 °C 12 °C 61 % 27

When to think twice

January scores lowest with about 10 wet days and highs near 9.7 °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 9.7 °C 80 mm 68 %
February 10.6 °C 99 mm 64 %
March 13.5 °C 149 mm 62 %
April 17.5 °C 169 mm 62 %
May 21.4 °C 191 mm 66 %
June 24.3 °C 446 mm 79 %
July 27.6 °C 342 mm 69 %
August 29.3 °C 184 mm 59 %
September 26.8 °C 208 mm 55 %
October 22.3 °C 107 mm 46 %
November 17.1 °C 105 mm 52 %
December 11.9 °C 90 mm 61 %

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.