Numazu climate

Name: Numazu
Address: JP

Numazu is warmest in August, with average highs of 29 °C, and coldest in January, when nights average 3.1 °C. June is the wettest month (262 mm) and December the driest (83 mm). Figures are 1991–2020 climate normals.

Across a full year Numazu averages 2,119 mm of rain, 91 days above 25 °C and 7 days below freezing.

Japan · population 189,486 · 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 29 °C
Coldest month January 3.1 °C
Driest month December 83 mm
Wettest month June 262 mm
Least cloud December 41 % cloud
Hottest on record August 35 °C
Coldest on record January -7.5 °C
Warmest sea August 27 °C

What to expectNumazu through the year

Numazu has a clear annual cycle: average daily highs run from 9.4 °C in January to 29 °C in August, a swing of 20 °C in mean temperature across the year.

Counted across a normal year, 91 days a year reach 25 °C, 16 of them reach 30 °C, 7 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in August.

Rain is strongly seasonal. June averages 262 mm against 83 mm in December — 3.2 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Numazu is warmest in August at 27 °C and coldest in February at 15 °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	9.4 °C	93 mm	42 %
February	10.0 °C	110 mm	50 %
March	13.0 °C	179 mm	59 %
April	17.4 °C	178 mm	63 %
May	21.4 °C	191 mm	70 %
June	24.2 °C	262 mm	83 %
July	27.7 °C	248 mm	77 %
August	29.0 °C	162 mm	66 %
September	26.1 °C	242 mm	67 %
October	21.3 °C	238 mm	60 %
November	16.6 °C	133 mm	52 %
December	11.9 °C	83 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	9.4 °C	3.1 °C	6.1 °C	18.1 °C	-7.5 °C	0	0	3
February	10.0 °C	3.2 °C	6.4 °C	21.7 °C	-4.9 °C	0	0	3
March	13.0 °C	5.8 °C	9.3 °C	22.2 °C	-2.8 °C	0	0	0
April	17.4 °C	10.1 °C	13.6 °C	25.2 °C	0.8 °C	0	0	0
May	21.4 °C	14.6 °C	17.9 °C	27.5 °C	7.6 °C	2	0	0
June	24.2 °C	18.7 °C	21.3 °C	32.4 °C	11.8 °C	10	0	0
July	27.7 °C	22.6 °C	24.9 °C	34.1 °C	17.1 °C	27	5	0
August	29.0 °C	23.7 °C	26.1 °C	34.7 °C	17.7 °C	30	9	0
September	26.1 °C	20.9 °C	23.3 °C	33.1 °C	12.7 °C	20	1	0
October	21.3 °C	15.9 °C	18.4 °C	29.3 °C	6.7 °C	3	0	0
November	16.6 °C	10.7 °C	13.5 °C	23.7 °C	2.2 °C	0	0	0
December	11.9 °C	5.9 °C	8.8 °C	21.5 °C	-2.0 °C	0	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	93 mm	8	10 h/day	42 %	71 %	17 km/h	15.9 °C
February	110 mm	9	11 h/day	50 %	72 %	17 km/h	15.0 °C
March	179 mm	13	12 h/day	59 %	75 %	18 km/h	15.2 °C
April	178 mm	12	13 h/day	63 %	78 %	18 km/h	16.6 °C
May	191 mm	12	14 h/day	70 %	82 %	15 km/h	18.9 °C
June	262 mm	16	15 h/day	83 %	87 %	15 km/h	21.5 °C
July	248 mm	15	14 h/day	77 %	88 %	15 km/h	24.3 °C
August	162 mm	15	13 h/day	66 %	87 %	14 km/h	26.6 °C
September	242 mm	15	12 h/day	67 %	84 %	15 km/h	25.6 °C
October	238 mm	13	11 h/day	60 %	81 %	15 km/h	23.1 °C
November	133 mm	9	10 h/day	52 %	78 %	15 km/h	20.7 °C
December	83 mm	8	9.8 h/day	41 %	73 %	17 km/h	18.0 °C

How Numazu 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
Numazu	29 °C	3.1 °C	2,119 mm	91
Fuji · Japan	29 °C	2.3 °C	2,387 mm	99
Odawara · Japan	28 °C	2.5 °C	2,137 mm	71
Hadano · Japan	28 °C	1.2 °C	1,862 mm	82
Shizuoka · Japan	29 °C	2.6 °C	2,441 mm	89
Atsugi · Japan	28 °C	1.8 °C	1,863 mm	74
Fujisawa · Japan	28 °C	3.1 °C	1,601 mm	72

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

QuestionsCommon questions about Numazu’s climate

When is the best time to visit Numazu?

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

How hot does Numazu get?

In August, the warmest month, daily highs average 29 °C. About 16 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 3.1 °C in January, the coldest month. A normal year has 7 nights below freezing.

Which month is wettest in Numazu?

June, averaging 262 mm over 16 days with rain. The driest month is December with 83 mm. The year as a whole averages 2,119 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 Numazu 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: 35.100°, 138.867° (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.