Mito climate

Name: Mito
Address: JP

Mito is warmest in August, with average highs of 28 °C, and coldest in January, when nights average 1.1 °C. October is the wettest month (208 mm) and December the driest (69 mm). Figures are 1991–2020 climate normals.

Across a full year Mito averages 1,541 mm of rain, 67 days above 25 °C and 24 days below freezing.

Japan · population 270,685 · 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 28 °C
Coldest month January 1.1 °C
Driest month December 69 mm
Wettest month October 208 mm
Least cloud January 40 % cloud
Hottest on record July 36 °C
Coldest on record January -13 °C
Warmest sea August 24 °C

What to expectMito through the year

Mito has a clear annual cycle: average daily highs run from 7.9 °C in January to 28 °C in August, a swing of 21 °C in mean temperature across the year.

Counted across a normal year, 67 days a year reach 25 °C, 10 of them reach 30 °C, 24 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in July.

Rain is strongly seasonal. October averages 208 mm against 69 mm in December — 3.0 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Mito is warmest in August at 24 °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	7.9 °C	73 mm	40 %
February	8.5 °C	72 mm	49 %
March	11.6 °C	123 mm	58 %
April	16.1 °C	122 mm	61 %
May	20.1 °C	149 mm	68 %
June	22.7 °C	160 mm	80 %
July	26.1 °C	161 mm	76 %
August	27.6 °C	116 mm	66 %
September	24.7 °C	185 mm	67 %
October	19.9 °C	208 mm	62 %
November	15.2 °C	102 mm	52 %
December	10.2 °C	69 mm	41 %

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	7.9 °C	1.1 °C	4.2 °C	16.2 °C	-13.3 °C	0	0	10
February	8.5 °C	1.5 °C	4.7 °C	19.0 °C	-5.6 °C	0	0	8
March	11.6 °C	4.1 °C	7.6 °C	22.9 °C	-5.0 °C	0	0	2
April	16.1 °C	8.6 °C	12.2 °C	27.0 °C	-2.2 °C	0	0	0
May	20.1 °C	13.3 °C	16.5 °C	31.0 °C	4.5 °C	1	0	0
June	22.7 °C	17.4 °C	19.8 °C	32.3 °C	11.3 °C	6	0	0
July	26.1 °C	21.2 °C	23.4 °C	35.5 °C	14.5 °C	19	3	0
August	27.6 °C	22.7 °C	24.9 °C	35.5 °C	14.7 °C	26	6	0
September	24.7 °C	19.9 °C	22.1 °C	33.7 °C	12.6 °C	13	1	0
October	19.9 °C	14.7 °C	17.1 °C	31.8 °C	5.4 °C	1	0	0
November	15.2 °C	9.0 °C	11.9 °C	23.8 °C	-1.1 °C	0	0	0
December	10.2 °C	3.6 °C	6.6 °C	22.0 °C	-5.0 °C	0	0	3

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	73 mm	7	10.0 h/day	40 %	64 %	22 km/h	14.6 °C
February	72 mm	9	11 h/day	49 %	64 %	23 km/h	13.0 °C
March	123 mm	12	12 h/day	58 %	68 %	23 km/h	13.1 °C
April	122 mm	12	13 h/day	61 %	73 %	23 km/h	14.5 °C
May	149 mm	13	14 h/day	68 %	79 %	20 km/h	16.9 °C
June	160 mm	15	15 h/day	80 %	85 %	18 km/h	19.4 °C
July	161 mm	15	14 h/day	76 %	87 %	17 km/h	21.7 °C
August	116 mm	11	14 h/day	66 %	86 %	18 km/h	24.1 °C
September	185 mm	14	12 h/day	67 %	83 %	20 km/h	23.3 °C
October	208 mm	13	11 h/day	62 %	77 %	20 km/h	20.8 °C
November	102 mm	10	10 h/day	52 %	73 %	20 km/h	18.8 °C
December	69 mm	9	9.7 h/day	41 %	68 %	21 km/h	16.4 °C

How Mito 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
Mito	28 °C	1.1 °C	1,541 mm	67
Hitachi-Naka · Japan	27 °C	1.3 °C	1,512 mm	63
Hitachi · Japan	27 °C	1.6 °C	1,531 mm	59
Tsukuba · Japan	30 °C	-0.9 °C	1,412 mm	96

Where Mito ranks

Ranking	Position	Value
The coolest places in Asia in June	40thof 50	23 °C

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

QuestionsCommon questions about Mito’s climate

When is the best time to visit Mito?

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

How hot does Mito get?

In August, the warmest month, daily highs average 28 °C. About 10 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 1.1 °C in January, the coldest month. A normal year has 24 nights below freezing.

Which month is wettest in Mito?

October, averaging 208 mm over 13 days with rain. The driest month is December with 69 mm. The year as a whole averages 1,541 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 Mito 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.