Sendai climate

Name: Sendai
Address: JP

Sendai is warmest in August, with average highs of 26 °C, and coldest in February, when nights average -2.4 °C. July is the wettest month (185 mm) and February the driest (51 mm). Figures are 1991–2020 climate normals.

Across a full year Sendai averages 1,319 mm of rain, 50 days above 25 °C and 79 days below freezing.

Japan · population 1,096,704 · 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 February -2.4 °C
Driest month February 51 mm
Wettest month July 185 mm
Least cloud November 56 % cloud
Hottest on record July 35 °C
Coldest on record March -14 °C
Warmest sea August 24 °C

What to expectSendai through the year

Sendai has a clear annual cycle: average daily highs run from 4.9 °C in February to 26 °C in August, a swing of 23 °C in mean temperature across the year.

Counted across a normal year, 50 days a year reach 25 °C, 6 of them reach 30 °C, 79 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in July.

Rain is strongly seasonal. July averages 185 mm against 51 mm in February — 3.6 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Sendai is warmest in August at 24 °C and coldest in March at 8.6 °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	4.1 °C	64 mm	59 %
February	4.9 °C	51 mm	60 %
March	8.5 °C	87 mm	60 %
April	13.9 °C	95 mm	60 %
May	18.6 °C	103 mm	68 %
June	21.4 °C	133 mm	79 %
July	24.9 °C	185 mm	82 %
August	26.4 °C	164 mm	76 %
September	23.4 °C	172 mm	73 %
October	18.3 °C	142 mm	62 %
November	12.6 °C	64 mm	56 %
December	6.9 °C	60 mm	58 %

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	4.1 °C	-2.4 °C	0.6 °C	12.2 °C	-14.1 °C	0	0	25
February	4.9 °C	-2.4 °C	0.9 °C	16.6 °C	-13.0 °C	0	0	23
March	8.5 °C	0.3 °C	4.1 °C	21.4 °C	-14.4 °C	0	0	15
April	13.9 °C	5.3 °C	9.4 °C	27.6 °C	-6.7 °C	0	0	1
May	18.6 °C	10.8 °C	14.5 °C	31.6 °C	3.0 °C	1	0	0
June	21.4 °C	15.4 °C	18.2 °C	32.2 °C	8.1 °C	3	0	0
July	24.9 °C	19.7 °C	22.0 °C	35.0 °C	11.4 °C	16	2	0
August	26.4 °C	21.1 °C	23.5 °C	34.6 °C	12.4 °C	20	4	0
September	23.4 °C	17.7 °C	20.3 °C	32.3 °C	7.5 °C	9	0	0
October	18.3 °C	11.6 °C	14.7 °C	26.7 °C	2.6 °C	0	0	0
November	12.6 °C	5.4 °C	8.7 °C	22.4 °C	-5.2 °C	0	0	1
December	6.9 °C	0.5 °C	3.4 °C	17.1 °C	-8.5 °C	0	0	14

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	64 mm	10	9.8 h/day	59 %	73 %	20 km/h	11.2 °C
February	51 mm	9	11 h/day	60 %	72 %	21 km/h	9.1 °C
March	87 mm	11	12 h/day	60 %	71 %	20 km/h	8.6 °C
April	95 mm	11	13 h/day	60 %	74 %	18 km/h	10.3 °C
May	103 mm	11	14 h/day	68 %	79 %	15 km/h	13.5 °C
June	133 mm	14	15 h/day	79 %	86 %	13 km/h	17.7 °C
July	185 mm	18	15 h/day	82 %	89 %	11 km/h	21.1 °C
August	164 mm	16	14 h/day	76 %	88 %	11 km/h	23.7 °C
September	172 mm	14	12 h/day	73 %	84 %	13 km/h	22.6 °C
October	142 mm	11	11 h/day	62 %	80 %	15 km/h	19.4 °C
November	64 mm	9	10 h/day	56 %	77 %	16 km/h	16.5 °C
December	60 mm	10	9.5 h/day	58 %	74 %	19 km/h	13.8 °C

Where Sendai ranks

Ranking	Position	Value
The coolest places in Asia in June	20th of 50	21 °C
The coolest places in Asia in May	33rd of 50	19 °C

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

QuestionsCommon questions about Sendai’s climate

When is the best time to visit Sendai?

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 Sendai get?

In August, the warmest month, daily highs average 26 °C. About 6 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 -2.4 °C in February, the coldest month. A normal year has 79 nights below freezing.

Which month is wettest in Sendai?

July, averaging 185 mm over 18 days with rain. The driest month is February with 51 mm. The year as a whole averages 1,319 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 Sendai 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: 38.267°, 140.867° (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.