Hachinohe climate

Name: Hachinohe
Address: JP

Hachinohe is warmest in August, with average highs of 26 °C, and coldest in January, when nights average -5.1 °C. August is the wettest month (139 mm) and January the driest (48 mm). Figures are 1991–2020 climate normals.

Across a full year Hachinohe averages 1,050 mm of rain, 49 days above 25 °C and 106 days below freezing.

Japan · population 239,046 · 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 26 °C
Coldest month January -5.1 °C
Driest month January 48 mm
Wettest month August 139 mm
Least cloud November 52 % cloud
Hottest on record August 35 °C
Coldest on record January -17 °C
Warmest sea August 21 °C

What to expectHachinohe through the year

Hachinohe has a clear annual cycle: average daily highs run from 1.2 °C in January to 26 °C in August, a swing of 25 °C in mean temperature across the year.

Counted across a normal year, 49 days a year reach 25 °C, 9 of them reach 30 °C, 106 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in August.

Rain is strongly seasonal. August averages 139 mm against 48 mm in January — 2.9 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Hachinohe is warmest in August at 21 °C and coldest in March at 6.6 °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	1.2 °C	48 mm	55 %
February	1.9 °C	50 mm	57 %
March	6.4 °C	74 mm	57 %
April	13.0 °C	78 mm	57 %
May	18.3 °C	90 mm	62 %
June	21.4 °C	94 mm	72 %
July	24.8 °C	137 mm	76 %
August	26.2 °C	139 mm	71 %
September	23.0 °C	132 mm	67 %
October	17.2 °C	101 mm	56 %
November	10.5 °C	55 mm	52 %
December	3.9 °C	52 mm	55 %

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	1.2 °C	-5.1 °C	-2.2 °C	12.0 °C	-16.8 °C	0	0	29
February	1.9 °C	-5.1 °C	-1.8 °C	17.5 °C	-15.7 °C	0	0	26
March	6.4 °C	-1.3 °C	2.1 °C	19.5 °C	-13.7 °C	0	0	20
April	13.0 °C	4.4 °C	8.2 °C	26.7 °C	-4.6 °C	0	0	3
May	18.3 °C	9.9 °C	13.7 °C	32.6 °C	0.0 °C	2	0	0
June	21.4 °C	14.0 °C	17.4 °C	29.8 °C	6.7 °C	4	0	0
July	24.8 °C	18.6 °C	21.3 °C	34.0 °C	9.0 °C	15	3	0
August	26.2 °C	19.9 °C	22.7 °C	34.9 °C	10.8 °C	20	5	0
September	23.0 °C	16.3 °C	19.3 °C	34.7 °C	7.6 °C	8	1	0
October	17.2 °C	9.9 °C	13.2 °C	26.9 °C	-0.1 °C	0	0	0
November	10.5 °C	3.7 °C	6.6 °C	22.7 °C	-8.2 °C	0	0	4
December	3.9 °C	-2.0 °C	0.6 °C	18.4 °C	-13.8 °C	0	0	23

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	48 mm	7	9.6 h/day	55 %	72 %	24 km/h	9.7 °C
February	50 mm	8	11 h/day	57 %	72 %	24 km/h	7.5 °C
March	74 mm	10	12 h/day	57 %	69 %	24 km/h	6.6 °C
April	78 mm	11	13 h/day	57 %	69 %	23 km/h	7.6 °C
May	90 mm	11	14 h/day	62 %	74 %	20 km/h	10.0 °C
June	94 mm	11	15 h/day	72 %	82 %	17 km/h	13.8 °C
July	137 mm	13	15 h/day	76 %	85 %	16 km/h	17.6 °C
August	139 mm	13	14 h/day	71 %	84 %	16 km/h	20.9 °C
September	132 mm	12	12 h/day	67 %	80 %	18 km/h	20.9 °C
October	101 mm	10	11 h/day	56 %	74 %	20 km/h	18.3 °C
November	55 mm	9	9.9 h/day	52 %	71 %	22 km/h	15.3 °C
December	52 mm	8	9.3 h/day	55 %	71 %	24 km/h	12.2 °C

How Hachinohe 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
Hachinohe	26 °C	-5.1 °C	1,050 mm	49
Aomori · Japan	27 °C	-5.7 °C	1,300 mm	54
Hirosaki · Japan	27 °C	-6.3 °C	1,416 mm	59
Morioka · Japan	26 °C	-7.5 °C	1,219 mm	52
Akita · Japan	27 °C	-2.3 °C	1,869 mm	47
Hakodate · Japan	24 °C	-5.4 °C	1,176 mm	17

Where Hachinohe ranks

Ranking	Position	Value
The coolest places in Asia in June	18th of 50	21 °C
The coolest places in Asia in May	27th of 50	18 °C
The coolest places in Asia in April	48th of 50	13 °C
The coolest places in Asia in July	48th of 50	25 °C

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

QuestionsCommon questions about Hachinohe’s climate

When is the best time to visit Hachinohe?

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

How hot does Hachinohe get?

In August, the warmest month, daily highs average 26 °C. About 9 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.

How cold does it get in winter?

Nights average -5.1 °C in January, the coldest month. A normal year has 106 nights below freezing.

Which month is wettest in Hachinohe?

August, averaging 139 mm over 13 days with rain. The driest month is January with 48 mm. The year as a whole averages 1,050 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 Hachinohe 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: 40.500°, 141.500° (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.