Nishio climate

Name: Nishio
Address: JP

Nishio is warmest in August, with average highs of 30 °C, and coldest in January, when nights average 1.4 °C. September is the wettest month (206 mm) and January the driest (54 mm). Figures are 1991–2020 climate normals.

Across a full year Nishio averages 1,497 mm of rain, 102 days above 25 °C and 20 days below freezing.

Japan · population 169,984 · 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 1.4 °C
Driest month January 54 mm
Wettest month September 206 mm
Least cloud December 37 % cloud
Hottest on record August 37 °C
Coldest on record January -5.5 °C
Warmest sea August 27 °C

What to expectNishio through the year

Nishio has a clear annual cycle: average daily highs run from 8.6 °C in January to 30 °C in August, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 102 days a year reach 25 °C, 25 of them reach 30 °C, 20 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in August.

Rain is strongly seasonal. September averages 206 mm against 54 mm in January — 3.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Nishio 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	8.6 °C	54 mm	40 %
February	9.5 °C	65 mm	46 %
March	13.0 °C	107 mm	51 %
April	17.7 °C	119 mm	56 %
May	22.0 °C	138 mm	64 %
June	25.1 °C	187 mm	77 %
July	28.4 °C	182 mm	71 %
August	29.9 °C	111 mm	59 %
September	26.7 °C	206 mm	60 %
October	21.4 °C	184 mm	53 %
November	16.1 °C	87 mm	44 %
December	10.9 °C	57 mm	37 %

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	8.6 °C	1.4 °C	4.7 °C	17.1 °C	-5.5 °C	0	0	8
February	9.5 °C	1.8 °C	5.3 °C	19.3 °C	-5.5 °C	0	0	7
March	13.0 °C	4.6 °C	8.6 °C	23.1 °C	-3.1 °C	0	0	2
April	17.7 °C	9.4 °C	13.4 °C	26.4 °C	-0.6 °C	0	0	0
May	22.0 °C	14.3 °C	18.0 °C	32.7 °C	5.1 °C	3	0	0
June	25.1 °C	18.8 °C	21.8 °C	33.1 °C	11.7 °C	15	1	0
July	28.4 °C	22.9 °C	25.5 °C	36.3 °C	16.8 °C	28	8	0
August	29.9 °C	24.0 °C	26.7 °C	37.3 °C	18.2 °C	30	14	0
September	26.7 °C	20.6 °C	23.4 °C	34.3 °C	11.7 °C	23	2	0
October	21.4 °C	14.8 °C	17.8 °C	29.6 °C	5.0 °C	3	0	0
November	16.1 °C	8.9 °C	12.2 °C	25.8 °C	0.2 °C	0	0	0
December	10.9 °C	3.7 °C	7.0 °C	21.6 °C	-4.6 °C	0	0	2

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	54 mm	5	10 h/day	40 %	68 %	23 km/h	14.2 °C
February	65 mm	7	11 h/day	46 %	67 %	24 km/h	13.4 °C
March	107 mm	10	12 h/day	51 %	68 %	24 km/h	13.7 °C
April	119 mm	10	13 h/day	56 %	71 %	23 km/h	15.4 °C
May	138 mm	10	14 h/day	64 %	75 %	21 km/h	18.4 °C
June	187 mm	14	14 h/day	77 %	81 %	19 km/h	21.8 °C
July	182 mm	14	14 h/day	71 %	84 %	17 km/h	25.4 °C
August	111 mm	12	13 h/day	59 %	80 %	18 km/h	27.3 °C
September	206 mm	12	12 h/day	60 %	79 %	18 km/h	25.7 °C
October	184 mm	10	11 h/day	53 %	77 %	18 km/h	22.4 °C
November	87 mm	7	10 h/day	44 %	74 %	19 km/h	19.4 °C
December	57 mm	6	9.8 h/day	37 %	71 %	21 km/h	16.6 °C

How Nishio 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
Nishio	30 °C	1.4 °C	1,497 mm	102
Anjō · Japan	31 °C	-0.08 °C	1,493 mm	111
Toyota · Japan	31 °C	0.03 °C	1,878 mm	115
Toyohashi · Japan	30 °C	1.6 °C	1,881 mm	106
Nagoya · Japan	31 °C	-0.6 °C	1,519 mm	113
Yokkaichi · Japan	30 °C	0.7 °C	1,707 mm	106

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

QuestionsCommon questions about Nishio’s climate

When is the best time to visit Nishio?

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 Nishio 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 37 °C.

How cold does it get in winter?

Nights average 1.4 °C in January, the coldest month. A normal year has 20 nights below freezing.

Which month is wettest in Nishio?

September, averaging 206 mm over 12 days with rain. The driest month is January with 54 mm. The year as a whole averages 1,497 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 Nishio 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: 34.867°, 137.050° (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.