Imabari climate

Name: Imabari
Address: JP

Imabari is warmest in August, with average highs of 30 °C, and coldest in January, when nights average 4.2 °C. June is the wettest month (250 mm) and January the driest (68 mm). Figures are 1991–2020 climate normals.

Across a full year Imabari averages 1,653 mm of rain, 100 days above 25 °C and 2 days below freezing.

Japan · population 170,986 · 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 4.2 °C
Driest month January 68 mm
Wettest month June 250 mm
Least cloud November 53 % cloud
Hottest on record August 36 °C
Coldest on record February -3.6 °C
Warmest sea August 28 °C

What to expectImabari through the year

Imabari has a clear annual cycle: average daily highs run from 8.5 °C in January to 30 °C in August, a swing of 21 °C in mean temperature across the year.

Counted across a normal year, 100 days a year reach 25 °C, 25 of them reach 30 °C, 2 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in August.

Rain is strongly seasonal. June averages 250 mm against 68 mm in January — 3.7 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Imabari is warmest in August at 28 °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	8.5 °C	68 mm	58 %
February	9.5 °C	79 mm	59 %
March	12.7 °C	118 mm	59 %
April	17.6 °C	132 mm	60 %
May	21.8 °C	152 mm	64 %
June	25.0 °C	250 mm	78 %
July	28.6 °C	214 mm	70 %
August	29.8 °C	141 mm	60 %
September	26.5 °C	193 mm	62 %
October	21.4 °C	145 mm	53 %
November	16.1 °C	82 mm	53 %
December	10.8 °C	79 mm	54 %

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	8.5 °C	4.2 °C	6.3 °C	18.3 °C	-2.8 °C	0	0	1
February	9.5 °C	4.4 °C	6.8 °C	19.1 °C	-3.6 °C	0	0	1
March	12.7 °C	6.9 °C	9.7 °C	22.7 °C	0.6 °C	0	0	0
April	17.6 °C	11.4 °C	14.4 °C	25.7 °C	2.3 °C	0	0	0
May	21.8 °C	15.8 °C	18.8 °C	30.0 °C	8.3 °C	2	0	0
June	25.0 °C	20.0 °C	22.4 °C	32.2 °C	14.5 °C	15	0	0
July	28.6 °C	24.1 °C	26.2 °C	34.5 °C	18.6 °C	29	8	0
August	29.8 °C	25.0 °C	27.3 °C	36.1 °C	19.8 °C	31	15	0
September	26.5 °C	21.8 °C	24.0 °C	35.1 °C	15.5 °C	21	2	0
October	21.4 °C	16.8 °C	18.9 °C	30.7 °C	8.5 °C	2	0	0
November	16.1 °C	11.5 °C	13.7 °C	25.3 °C	2.5 °C	0	0	0
December	10.8 °C	6.6 °C	8.6 °C	22.7 °C	-0.6 °C	0	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	68 mm	11	10 h/day	58 %	70 %	20 km/h	14.5 °C
February	79 mm	10	11 h/day	59 %	71 %	19 km/h	13.1 °C
March	118 mm	12	12 h/day	59 %	72 %	18 km/h	13.4 °C
April	132 mm	11	13 h/day	60 %	74 %	16 km/h	15.1 °C
May	152 mm	11	14 h/day	64 %	77 %	14 km/h	18.0 °C
June	250 mm	15	14 h/day	78 %	83 %	13 km/h	21.6 °C
July	214 mm	15	14 h/day	70 %	84 %	13 km/h	25.2 °C
August	141 mm	13	13 h/day	60 %	82 %	13 km/h	27.5 °C
September	193 mm	13	12 h/day	62 %	79 %	15 km/h	26.5 °C
October	145 mm	10	11 h/day	53 %	76 %	16 km/h	23.5 °C
November	82 mm	9	10 h/day	53 %	74 %	17 km/h	19.8 °C
December	79 mm	11	9.9 h/day	54 %	72 %	19 km/h	16.7 °C

How Imabari 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
Imabari	30 °C	4.2 °C	1,653 mm	100
Matsuyama · Japan	31 °C	3.4 °C	1,697 mm	115
Kure · Japan	29 °C	3.4 °C	1,527 mm	82
Higashihiroshima · Japan	29 °C	0.3 °C	1,413 mm	94
Shinagawa · Japan	30 °C	0.4 °C	1,992 mm	108
Fukuyama · Japan	31 °C	2.1 °C	1,257 mm	114
Hiroshima · Japan	30 °C	1.6 °C	1,563 mm	110

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

QuestionsCommon questions about Imabari’s climate

When is the best time to visit Imabari?

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 Imabari get?

In August, the warmest month, daily highs average 30 °C. About 25 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 4.2 °C in January, the coldest month. A normal year has 2 nights below freezing.

Which month is wettest in Imabari?

June, averaging 250 mm over 15 days with rain. The driest month is January with 68 mm. The year as a whole averages 1,653 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 Imabari 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.