Monthly Climate
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Best time to visit Izumo

October is the best time to visit Izumo for general sightseeing, with average highs of 20 °C and about 10 wet days. The comfortable season runs roughly May to June. 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 86/100
A beach holiday August sea 27 °C
The least cloud October 56 % average cloud cover
The least rain November 88 mm
Warmth August 29 °C
Cooler weather January 7.4 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 86 20 °C 10 62
2 May 86 20 °C 10 43
3 June 79 24 °C 13 61
4 September 75 25 °C 14 75
5 April 71 16 °C 11 17
6 November 70 15 °C 12 33
7 July 61 27 °C 15 74
8 August 58 29 °C 14 76
9 March 47 11 °C 15 1
10 December 40 9.9 °C 17 12
11 February 35 8.0 °C 15 0
12 January 29 7.4 °C 17 2

For a beach holiday

August scores highest, with a sea temperature of 27 °C and air temperatures around 29 °C. The sea is above 20 °C from June to November.

Month Sea Air Sunshine Beach score
January 15 °C 7.4 °C 70 % 2
February 13 °C 8.0 °C 69 % 0
March 13 °C 11 °C 63 % 1
April 15 °C 16 °C 60 % 17
May 17 °C 20 °C 62 % 43
June 21 °C 24 °C 75 % 61
July 24 °C 27 °C 71 % 74
August 27 °C 29 °C 61 % 76
September 25 °C 25 °C 65 % 75
October 23 °C 20 °C 56 % 62
November 20 °C 15 °C 60 % 33
December 17 °C 9.9 °C 67 % 12

When to think twice

January scores lowest with about 17 wet days and highs near 7.4 °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 7.4 °C 99 mm 70 %
February 8.0 °C 93 mm 69 %
March 11.1 °C 116 mm 63 %
April 16.0 °C 107 mm 60 %
May 20.3 °C 118 mm 62 %
June 23.7 °C 172 mm 75 %
July 27.2 °C 207 mm 71 %
August 28.8 °C 148 mm 61 %
September 25.0 °C 189 mm 65 %
October 20.1 °C 105 mm 56 %
November 15.1 °C 88 mm 60 %
December 9.9 °C 104 mm 67 %

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.