Kushiro climate

Name: Kushiro
Address: JP

Kushiro is warmest in August, with average highs of 20 °C, and coldest in February, when nights average -8.8 °C. September is the wettest month (160 mm) and February the driest (38 mm). Figures are 1991–2020 climate normals.

Across a full year Kushiro averages 1,133 mm of rain, 1 days above 25 °C and 133 days below freezing.

Japan · population 167,875 · 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 20 °C
Coldest month February -8.8 °C
Driest month February 38 mm
Wettest month September 160 mm
Least cloud December 41 % cloud
Hottest on record July 27 °C
Coldest on record February -21 °C
Warmest sea August 17 °C

What to expectKushiro through the year

Kushiro has a clear annual cycle: average daily highs run from -1.8 °C in February to 20 °C in August, a swing of 23 °C in mean temperature across the year.

Counted across a normal year, 1 days a year reach 25 °C, 133 nights drop below freezing. The warmest reading in the 1991–2020 record is 27 °C, in July.

Rain is strongly seasonal. September averages 160 mm against 38 mm in February — 4.2 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Kushiro is warmest in August at 17 °C and coldest in February at 0.8 °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	-1.8 °C	51 mm	44 %
February	-1.8 °C	38 mm	50 %
March	1.8 °C	69 mm	55 %
April	6.8 °C	86 mm	62 %
May	11.3 °C	105 mm	69 %
June	14.4 °C	88 mm	79 %
July	18.3 °C	124 mm	83 %
August	20.4 °C	151 mm	80 %
September	18.7 °C	160 mm	68 %
October	14.0 °C	114 mm	51 %
November	7.8 °C	75 mm	45 %
December	1.3 °C	71 mm	41 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days below 0 °C
January	-1.8 °C	-8.2 °C	-4.9 °C	6.3 °C	-19.5 °C	0	31
February	-1.8 °C	-8.8 °C	-5.2 °C	5.5 °C	-21.0 °C	0	28
March	1.8 °C	-4.4 °C	-1.3 °C	12.2 °C	-15.2 °C	0	27
April	6.8 °C	0.9 °C	3.7 °C	19.2 °C	-9.3 °C	0	11
May	11.3 °C	5.8 °C	8.3 °C	25.1 °C	-1.4 °C	0	0
June	14.4 °C	10.0 °C	12.0 °C	23.1 °C	3.2 °C	0	0
July	18.3 °C	14.3 °C	16.0 °C	27.3 °C	7.2 °C	0	0
August	20.4 °C	16.5 °C	18.2 °C	27.3 °C	9.2 °C	1	0
September	18.7 °C	14.1 °C	16.3 °C	26.4 °C	4.8 °C	0	0
October	14.0 °C	8.7 °C	11.3 °C	21.1 °C	-0.4 °C	0	0
November	7.8 °C	2.3 °C	5.0 °C	16.0 °C	-7.3 °C	0	9
December	1.3 °C	-4.2 °C	-1.5 °C	11.7 °C	-15.6 °C	0	27

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	51 mm	6	9.4 h/day	44 %	69 %	24 km/h	2.7 °C
February	38 mm	6	11 h/day	50 %	72 %	24 km/h	0.8 °C
March	69 mm	8	12 h/day	55 %	74 %	25 km/h	0.9 °C
April	86 mm	9	13 h/day	62 %	78 %	23 km/h	2.5 °C
May	105 mm	10	15 h/day	69 %	83 %	21 km/h	5.6 °C
June	88 mm	10	15 h/day	79 %	89 %	17 km/h	10.1 °C
July	124 mm	12	15 h/day	83 %	91 %	16 km/h	14.4 °C
August	151 mm	12	14 h/day	80 %	90 %	18 km/h	17.1 °C
September	160 mm	11	13 h/day	68 %	84 %	21 km/h	16.7 °C
October	114 mm	10	11 h/day	51 %	76 %	24 km/h	13.6 °C
November	75 mm	9	9.7 h/day	45 %	69 %	26 km/h	10.0 °C
December	71 mm	8	9.0 h/day	41 %	66 %	26 km/h	6.3 °C

How Kushiro 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
Kushiro	20 °C	-8.8 °C	1,133 mm	1
Obihiro · Japan	24 °C	-14 °C	1,158 mm	30
Asahikawa · Japan	24 °C	-12 °C	1,212 mm	30
Tomakomai · Japan	23 °C	-7.6 °C	1,215 mm	7
Sapporo · Japan	24 °C	-9.4 °C	1,162 mm	25
Hakodate · Japan	24 °C	-5.4 °C	1,176 mm	17
Hachinohe · Japan	26 °C	-5.1 °C	1,050 mm	49

Where Kushiro ranks

Ranking	Position	Value
The coolest places in Asia in June	1st of 50	14 °C
The coolest places in Asia in April	2nd of 50	6.8 °C
The coolest places in Asia in July	2nd of 50	18 °C
The coolest places in Asia in May	2nd of 50	11 °C
The coolest places in Asia in August	7th of 50	20 °C
The coolest places in Asia year-round	18th of 50	9.3 °C

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

QuestionsCommon questions about Kushiro’s climate

When is the best time to visit Kushiro?

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

How hot does Kushiro get?

In August, the warmest month, daily highs average 20 °C. The highest value in the 1991–2020 record is 27 °C.

How cold does it get in winter?

Nights average -8.8 °C in February, the coldest month. A normal year has 133 nights below freezing.

Which month is wettest in Kushiro?

September, averaging 160 mm over 11 days with rain. The driest month is February with 38 mm. The year as a whole averages 1,133 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 Kushiro 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: 42.975°, 144.375° (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.