Akashi climate

Name: Akashi
Address: JP

Akashi is warmest in August, with average highs of 30 °C, and coldest in January, when nights average 2.2 °C. September is the wettest month (194 mm) and January the driest (50 mm). Figures are 1991–2020 climate normals.

Across a full year Akashi averages 1,438 mm of rain, 98 days above 25 °C and 11 days below freezing.

Japan · population 303,601 · 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 30 °C
Coldest month January 2.2 °C
Driest month January 50 mm
Wettest month September 194 mm
Least cloud December 47 % cloud
Hottest on record August 35 °C
Coldest on record January -3.5 °C
Warmest sea August 27 °C

What to expectAkashi through the year

Akashi has a clear annual cycle: average daily highs run from 8.3 °C in January to 30 °C in August, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 98 days a year reach 25 °C, 17 of them reach 30 °C, 11 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in August.

Rain is strongly seasonal. September averages 194 mm against 50 mm in January — 3.9 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Akashi 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	8.3 °C	50 mm	51 %
February	9.1 °C	63 mm	54 %
March	12.3 °C	100 mm	57 %
April	17.1 °C	118 mm	58 %
May	21.4 °C	137 mm	64 %
June	24.7 °C	183 mm	77 %
July	28.0 °C	189 mm	70 %
August	29.5 °C	117 mm	58 %
September	26.4 °C	194 mm	59 %
October	21.2 °C	152 mm	51 %
November	15.9 °C	74 mm	48 %
December	10.6 °C	62 mm	47 %

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	8.3 °C	2.2 °C	5.1 °C	16.5 °C	-3.5 °C	0	0	4
February	9.1 °C	2.3 °C	5.5 °C	18.4 °C	-3.3 °C	0	0	6
March	12.3 °C	5.1 °C	8.6 °C	19.3 °C	-1.7 °C	0	0	1
April	17.1 °C	10.1 °C	13.5 °C	25.0 °C	0.3 °C	0	0	0
May	21.4 °C	15.0 °C	18.1 °C	28.4 °C	5.5 °C	1	0	0
June	24.7 °C	19.4 °C	21.9 °C	30.5 °C	12.0 °C	13	0	0
July	28.0 °C	23.6 °C	25.6 °C	33.6 °C	17.9 °C	29	4	0
August	29.5 °C	24.7 °C	26.9 °C	34.8 °C	19.0 °C	31	12	0
September	26.4 °C	21.1 °C	23.5 °C	34.5 °C	12.1 °C	22	2	0
October	21.2 °C	15.4 °C	18.1 °C	29.0 °C	7.0 °C	2	0	0
November	15.9 °C	9.7 °C	12.7 °C	24.0 °C	2.1 °C	0	0	0
December	10.6 °C	4.7 °C	7.6 °C	21.4 °C	-1.7 °C	0	0	1

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	50 mm	6	10 h/day	51 %	71 %	20 km/h	14.4 °C
February	63 mm	7	11 h/day	54 %	70 %	20 km/h	13.1 °C
March	100 mm	10	12 h/day	57 %	70 %	21 km/h	13.5 °C
April	118 mm	10	13 h/day	58 %	73 %	20 km/h	15.2 °C
May	137 mm	9	14 h/day	64 %	78 %	18 km/h	17.8 °C
June	183 mm	13	14 h/day	77 %	83 %	17 km/h	21.2 °C
July	189 mm	13	14 h/day	70 %	85 %	17 km/h	24.7 °C
August	117 mm	11	13 h/day	58 %	82 %	17 km/h	26.8 °C
September	194 mm	12	12 h/day	59 %	78 %	18 km/h	25.9 °C
October	152 mm	9	11 h/day	51 %	75 %	18 km/h	23.1 °C
November	74 mm	7	10 h/day	48 %	74 %	17 km/h	19.6 °C
December	62 mm	6	9.9 h/day	47 %	72 %	19 km/h	16.7 °C

How Akashi 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
Akashi	30 °C	2.2 °C	1,438 mm	98
Kobe · Japan	30 °C	2.1 °C	1,569 mm	110
Nishinomiya · Japan	31 °C	1.5 °C	1,561 mm	119
Himeji · Japan	29 °C	1.8 °C	1,541 mm	92
Kishiwada · Japan	31 °C	0.8 °C	1,481 mm	110
Sakai · Japan	31 °C	1.3 °C	1,449 mm	113
Izumi · Japan	31 °C	0.6 °C	1,456 mm	107

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

QuestionsCommon questions about Akashi’s climate

When is the best time to visit Akashi?

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

How hot does Akashi get?

In August, the warmest month, daily highs average 30 °C. About 17 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 2.2 °C in January, the coldest month. A normal year has 11 nights below freezing.

Which month is wettest in Akashi?

September, averaging 194 mm over 12 days with rain. The driest month is January with 50 mm. The year as a whole averages 1,438 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 Akashi 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
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.