Hitachi-Naka climate

Name: Hitachi-Naka
Address: JP

Hitachi-Naka is warmest in August, with average highs of 27 °C, and coldest in January, when nights average 1.3 °C. October is the wettest month (196 mm) and January the driest (63 mm). Figures are 1991–2020 climate normals.

Across a full year Hitachi-Naka averages 1,512 mm of rain, 63 days above 25 °C and 21 days below freezing.

Japan · population 156,581 · 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 1.3 °C
Driest month January 63 mm
Wettest month October 196 mm
Least cloud January 40 % cloud
Hottest on record August 34 °C
Coldest on record January -12 °C
Warmest sea August 24 °C

What to expectHitachi-Naka through the year

Hitachi-Naka has a clear annual cycle: average daily highs run from 7.9 °C in January to 27 °C in August, a swing of 20 °C in mean temperature across the year.

Counted across a normal year, 63 days a year reach 25 °C, 7 of them reach 30 °C, 21 nights drop below freezing. The warmest reading in the 1991–2020 record is 34 °C, in August.

Rain is strongly seasonal. October averages 196 mm against 63 mm in January — 3.1 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Hitachi-Naka 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	63 mm	40 %
February	8.5 °C	66 mm	48 %
March	11.5 °C	114 mm	57 %
April	15.9 °C	120 mm	61 %
May	19.8 °C	146 mm	69 %
June	22.4 °C	155 mm	80 %
July	25.9 °C	176 mm	78 %
August	27.4 °C	130 mm	69 %
September	24.6 °C	187 mm	69 %
October	19.9 °C	196 mm	62 %
November	15.2 °C	97 mm	51 %
December	10.2 °C	64 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	1.3 °C	4.4 °C	15.7 °C	-12.3 °C	0	0	9
February	8.5 °C	1.7 °C	4.8 °C	19.0 °C	-4.4 °C	0	0	8
March	11.5 °C	4.3 °C	7.7 °C	22.1 °C	-3.6 °C	0	0	2
April	15.9 °C	8.8 °C	12.2 °C	25.4 °C	0.1 °C	0	0	0
May	19.8 °C	13.4 °C	16.5 °C	27.1 °C	5.8 °C	1	0	0
June	22.4 °C	17.4 °C	19.8 °C	30.9 °C	11.3 °C	5	0	0
July	25.9 °C	21.3 °C	23.3 °C	32.4 °C	14.5 °C	19	2	0
August	27.4 °C	22.7 °C	24.8 °C	33.9 °C	16.1 °C	25	4	0
September	24.6 °C	20.0 °C	22.1 °C	32.8 °C	12.6 °C	13	1	0
October	19.9 °C	14.9 °C	17.2 °C	29.6 °C	6.4 °C	1	0	0
November	15.2 °C	9.2 °C	12.0 °C	23.1 °C	1.5 °C	0	0	0
December	10.2 °C	3.8 °C	6.8 °C	22.0 °C	-3.6 °C	0	0	2

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	63 mm	7	10.0 h/day	40 %	64 %	19 km/h	14.6 °C
February	66 mm	8	11 h/day	48 %	64 %	20 km/h	13.0 °C
March	114 mm	12	12 h/day	57 %	68 %	20 km/h	13.1 °C
April	120 mm	12	13 h/day	61 %	74 %	19 km/h	14.5 °C
May	146 mm	13	14 h/day	69 %	80 %	17 km/h	16.9 °C
June	155 mm	15	15 h/day	80 %	86 %	16 km/h	19.4 °C
July	176 mm	15	14 h/day	78 %	88 %	15 km/h	21.7 °C
August	130 mm	13	14 h/day	69 %	86 %	15 km/h	24.1 °C
September	187 mm	15	12 h/day	69 %	83 %	17 km/h	23.3 °C
October	196 mm	13	11 h/day	62 %	77 %	17 km/h	20.8 °C
November	97 mm	9	10 h/day	51 %	73 %	17 km/h	18.8 °C
December	64 mm	8	9.7 h/day	41 %	67 %	18 km/h	16.4 °C

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

Where Hitachi-Naka ranks

Ranking	Position	Value
The coolest places in Asia in June	35th of 50	22 °C

Planning a trip? See the best time to visit Hitachi-Naka.

QuestionsCommon questions about Hitachi-Naka’s climate

When is the best time to visit Hitachi-Naka?

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

How hot does Hitachi-Naka get?

In August, the warmest month, daily highs average 27 °C. About 7 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.

How cold does it get in winter?

Nights average 1.3 °C in January, the coldest month. A normal year has 21 nights below freezing.

Which month is wettest in Hitachi-Naka?

October, averaging 196 mm over 13 days with rain. The driest month is January with 63 mm. The year as a whole averages 1,512 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 Hitachi-Naka 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: 36.397°, 140.535° (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.