Izumo climate

Name: Izumo
Address: JP

Izumo is warmest in August, with average highs of 29 °C, and coldest in January, when nights average 3.5 °C. July is the wettest month (207 mm) and November the driest (88 mm). Figures are 1991–2020 climate normals.

Across a full year Izumo averages 1,545 mm of rain, 78 days above 25 °C and 5 days below freezing.

Japan · population 172,775 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month August 29 °C
Coldest month January 3.5 °C
Driest month November 88 mm
Wettest month July 207 mm
Least cloud October 56 % cloud
Hottest on record August 38 °C
Coldest on record February -6.2 °C
Warmest sea August 27 °C

What to expectIzumo through the year

Izumo has a clear annual cycle: average daily highs run from 7.4 °C in January to 29 °C in August, a swing of 21 °C in mean temperature across the year.

Counted across a normal year, 78 days a year reach 25 °C, 14 of them reach 30 °C, 5 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in August.

Rain is strongly seasonal. July averages 207 mm against 88 mm in November — 2.3 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Izumo is warmest in August at 27 °C and coldest in February at 13 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

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 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	7.4 °C	3.5 °C	5.4 °C	17.6 °C	-5.2 °C	0	0	2
February	8.0 °C	3.5 °C	5.8 °C	19.6 °C	-6.2 °C	0	0	2
March	11.1 °C	5.9 °C	8.4 °C	21.9 °C	-1.4 °C	0	0	0
April	16.0 °C	10.2 °C	13.0 °C	25.7 °C	0.9 °C	0	0	0
May	20.3 °C	14.7 °C	17.4 °C	27.9 °C	5.6 °C	1	0	0
June	23.7 °C	18.9 °C	21.2 °C	30.9 °C	11.1 °C	8	0	0
July	27.2 °C	23.3 °C	25.1 °C	34.2 °C	16.9 °C	25	3	0
August	28.8 °C	24.6 °C	26.5 °C	38.3 °C	18.7 °C	29	10	0
September	25.0 °C	20.8 °C	22.8 °C	35.3 °C	12.2 °C	14	1	0
October	20.1 °C	15.6 °C	17.8 °C	29.6 °C	6.8 °C	1	0	0
November	15.1 °C	10.6 °C	12.8 °C	24.4 °C	0.9 °C	0	0	0
December	9.9 °C	5.9 °C	7.9 °C	21.6 °C	-1.0 °C	0	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	99 mm	17	10 h/day	70 %	70 %	22 km/h	14.6 °C
February	93 mm	15	11 h/day	69 %	70 %	21 km/h	13.1 °C
March	116 mm	15	12 h/day	63 %	70 %	21 km/h	13.2 °C
April	107 mm	11	13 h/day	60 %	72 %	20 km/h	14.5 °C
May	118 mm	10	14 h/day	62 %	76 %	18 km/h	17.1 °C
June	172 mm	13	15 h/day	75 %	82 %	16 km/h	20.5 °C
July	207 mm	15	14 h/day	71 %	85 %	17 km/h	24.0 °C
August	148 mm	14	14 h/day	61 %	81 %	16 km/h	26.7 °C
September	189 mm	14	12 h/day	65 %	79 %	17 km/h	25.4 °C
October	105 mm	10	11 h/day	56 %	73 %	17 km/h	22.5 °C
November	88 mm	12	10 h/day	60 %	71 %	19 km/h	20.0 °C
December	104 mm	17	9.8 h/day	67 %	70 %	21 km/h	17.1 °C

How Izumo compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Izumo	29 °C	3.5 °C	1,545 mm	78
Matsue · Japan	28 °C	4.1 °C	1,726 mm	71
Higashihiroshima · Japan	29 °C	0.3 °C	1,413 mm	94
Hiroshima · Japan	30 °C	1.6 °C	1,563 mm	110
Fukuyama · Japan	31 °C	2.1 °C	1,257 mm	114
Kurashiki · Japan	31 °C	2.5 °C	1,297 mm	112
Kure · Japan	29 °C	3.4 °C	1,527 mm	82

Planning a trip? See the best time to visit Izumo.

QuestionsCommon questions about Izumo’s climate

When is the best time to visit Izumo?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, June, October sit closest to 20 °C on average, August is the warmest month and November the driest. The month-by-month table above has the full picture.

How hot does Izumo get?

In August, the warmest month, daily highs average 29 °C. About 14 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average 3.5 °C in January, the coldest month. A normal year has 5 nights below freezing.

Which month is wettest in Izumo?

July, averaging 207 mm over 15 days with rain. The driest month is November with 88 mm. The year as a whole averages 1,545 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Izumo rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 35.367°, 132.767° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. 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.