Monthly Climate
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Best time to visit Sendai

June is the best time to visit Sendai for general sightseeing, with average highs of 21 °C and about 14 wet days. The comfortable season runs roughly May to June. The sea stays above 20 °C from July 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 June comfort 81/100
A beach holiday August sea 24 °C
The least cloud November 56 % average cloud cover
The least rain February 51 mm
Warmth August 26 °C
Cooler weather January 4.1 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 June 81 21 °C 14 42
2 October 80 18 °C 11 43
3 May 79 19 °C 11 23
4 September 79 23 °C 14 65
5 July 69 25 °C 18 63
6 August 66 26 °C 16 73
7 April 59 14 °C 11 9
8 November 59 13 °C 9 22
9 March 37 8.5 °C 11 9
10 December 33 6.9 °C 10 10
11 February 28 4.9 °C 9 12
12 January 27 4.1 °C 10 11

For a beach holiday

August scores highest, with a sea temperature of 24 °C and air temperatures around 26 °C. The sea is above 20 °C from July to September.

Month Sea Air Sunshine Beach score
January 11 °C 4.1 °C 59 % 11
February 9.1 °C 4.9 °C 60 % 12
March 8.6 °C 8.5 °C 60 % 9
April 10 °C 14 °C 60 % 9
May 14 °C 19 °C 68 % 23
June 18 °C 21 °C 79 % 42
July 21 °C 25 °C 82 % 63
August 24 °C 26 °C 76 % 73
September 23 °C 23 °C 73 % 65
October 19 °C 18 °C 62 % 43
November 17 °C 13 °C 56 % 22
December 14 °C 6.9 °C 58 % 10

When to think twice

January scores lowest with about 10 wet days and highs near 4.1 °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 4.1 °C 64 mm 59 %
February 4.9 °C 51 mm 60 %
March 8.5 °C 87 mm 60 %
April 13.9 °C 95 mm 60 %
May 18.6 °C 103 mm 68 %
June 21.4 °C 133 mm 79 %
July 24.9 °C 185 mm 82 %
August 26.4 °C 164 mm 76 %
September 23.4 °C 172 mm 73 %
October 18.3 °C 142 mm 62 %
November 12.6 °C 64 mm 56 %
December 6.9 °C 60 mm 58 %

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.