Aomori climate

Name: Aomori
Address: JP

Aomori is warmest in August, with average highs of 27 °C, and coldest in January, when nights average -5.7 °C. August is the wettest month (170 mm) and February the driest (71 mm). Figures are 1991–2020 climate normals.

Across a full year Aomori averages 1,300 mm of rain, 54 days above 25 °C and 114 days below freezing.

Japan · population 298,394 · 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 27 °C
Coldest month January -5.7 °C
Driest month February 71 mm
Wettest month August 170 mm
Least cloud April 61 % cloud
Hottest on record August 36 °C
Coldest on record January -17 °C
Warmest sea August 23 °C

What to expectAomori through the year

Aomori has a clear annual cycle: average daily highs run from -0.1 °C in January to 27 °C in August, a swing of 26 °C in mean temperature across the year.

Counted across a normal year, 54 days a year reach 25 °C, 8 of them reach 30 °C, 114 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in August.

Rain is strongly seasonal. August averages 170 mm against 71 mm in February — 2.4 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Aomori is warmest in August at 23 °C and coldest in March at 7.6 °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	-0.1 °C	73 mm	71 %
February	0.8 °C	71 mm	70 %
March	4.7 °C	90 mm	64 %
April	12.4 °C	88 mm	61 %
May	18.5 °C	100 mm	65 %
June	22.4 °C	104 mm	73 %
July	25.5 °C	153 mm	77 %
August	26.7 °C	170 mm	73 %
September	22.9 °C	146 mm	70 %
October	16.6 °C	113 mm	63 %
November	9.4 °C	96 mm	65 %
December	2.6 °C	94 mm	70 %

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	-0.1 °C	-5.7 °C	-2.9 °C	8.4 °C	-17.3 °C	0	0	30
February	0.8 °C	-5.2 °C	-2.3 °C	11.9 °C	-14.9 °C	0	0	27
March	4.7 °C	-2.2 °C	1.0 °C	18.4 °C	-12.5 °C	0	0	23
April	12.4 °C	3.7 °C	7.6 °C	25.6 °C	-6.4 °C	0	0	4
May	18.5 °C	9.5 °C	13.6 °C	31.3 °C	0.2 °C	2	0	0
June	22.4 °C	14.3 °C	18.0 °C	31.5 °C	6.9 °C	7	0	0
July	25.5 °C	18.9 °C	21.8 °C	34.4 °C	10.7 °C	18	2	0
August	26.7 °C	20.1 °C	23.0 °C	35.9 °C	11.5 °C	21	5	0
September	22.9 °C	16.1 °C	19.2 °C	33.3 °C	6.7 °C	7	1	0
October	16.6 °C	9.6 °C	12.8 °C	25.5 °C	0.9 °C	0	0	0
November	9.4 °C	3.3 °C	6.0 °C	21.7 °C	-11.5 °C	0	0	5
December	2.6 °C	-2.8 °C	-0.2 °C	17.6 °C	-12.2 °C	0	0	25

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	73 mm	14	9.6 h/day	71 %	80 %	19 km/h	10.2 °C
February	71 mm	13	11 h/day	70 %	79 %	20 km/h	8.2 °C
March	90 mm	15	12 h/day	64 %	78 %	20 km/h	7.6 °C
April	88 mm	13	13 h/day	61 %	75 %	20 km/h	7.9 °C
May	100 mm	13	14 h/day	65 %	77 %	17 km/h	10.8 °C
June	104 mm	12	15 h/day	73 %	82 %	14 km/h	15.2 °C
July	153 mm	15	15 h/day	77 %	86 %	14 km/h	19.1 °C
August	170 mm	15	14 h/day	73 %	85 %	14 km/h	22.6 °C
September	146 mm	13	12 h/day	70 %	82 %	15 km/h	22.3 °C
October	113 mm	13	11 h/day	63 %	79 %	17 km/h	19.1 °C
November	96 mm	15	9.9 h/day	65 %	78 %	19 km/h	15.2 °C
December	94 mm	16	9.3 h/day	70 %	79 %	20 km/h	12.3 °C

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

Where Aomori ranks

Ranking	Position	Value
The coolest places in Asia in May	30th of 50	18 °C
The coolest places in Asia in June	34th of 50	22 °C
The coolest places in Asia in April	41st of 50	12 °C
The coolest places in Asia in March	45th of 50	4.7 °C

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

QuestionsCommon questions about Aomori’s climate

When is the best time to visit Aomori?

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 February the driest. The month-by-month table above has the full picture.

How hot does Aomori get?

In August, the warmest month, daily highs average 27 °C. About 8 days a year pass 30 °C. The highest value in the 1991–2020 record is 36 °C.

How cold does it get in winter?

Nights average -5.7 °C in January, the coldest month. A normal year has 114 nights below freezing.

Which month is wettest in Aomori?

August, averaging 170 mm over 15 days with rain. The driest month is February with 71 mm. The year as a whole averages 1,300 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 Aomori 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: 40.817°, 140.733° (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.