Niigata climate

Name: Niigata
Address: JP

Niigata is warmest in August, with average highs of 28 °C, and coldest in February, when nights average -0.09 °C. July is the wettest month (213 mm) and April the driest (93 mm). Figures are 1991–2020 climate normals.

Across a full year Niigata averages 1,727 mm of rain, 70 days above 25 °C and 38 days below freezing.

Japan · population 797,591 · 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 February -0.09 °C
Driest month April 93 mm
Wettest month July 213 mm
Least cloud April 61 % cloud
Hottest on record August 38 °C
Coldest on record February -7.9 °C
Warmest sea August 26 °C

What to expectNiigata through the year

Niigata has a clear annual cycle: average daily highs run from 4.6 °C in February to 28 °C in August, a swing of 23 °C in mean temperature across the year.

Counted across a normal year, 70 days a year reach 25 °C, 13 of them reach 30 °C, 38 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in August.

Rain is strongly seasonal. July averages 213 mm against 93 mm in April — 2.3 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Niigata is warmest in August at 26 °C and coldest in March at 9.7 °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	4.2 °C	178 mm	76 %
February	4.6 °C	119 mm	73 %
March	8.5 °C	119 mm	68 %
April	14.1 °C	93 mm	61 %
May	19.4 °C	95 mm	64 %
June	23.1 °C	122 mm	72 %
July	26.6 °C	213 mm	73 %
August	28.3 °C	151 mm	62 %
September	24.7 °C	142 mm	67 %
October	19.0 °C	147 mm	63 %
November	13.1 °C	157 mm	66 %
December	7.4 °C	190 mm	74 %

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	4.2 °C	0.3 °C	2.2 °C	13.9 °C	-6.8 °C	0	0	14
February	4.6 °C	-0.1 °C	2.2 °C	18.7 °C	-7.9 °C	0	0	15
March	8.5 °C	2.4 °C	5.3 °C	20.4 °C	-4.6 °C	0	0	6
April	14.1 °C	6.7 °C	10.2 °C	24.6 °C	-1.4 °C	0	0	0
May	19.4 °C	12.0 °C	15.6 °C	28.5 °C	3.8 °C	1	0	0
June	23.1 °C	17.0 °C	20.0 °C	32.0 °C	9.8 °C	6	0	0
July	26.6 °C	21.5 °C	23.9 °C	35.4 °C	14.4 °C	22	3	0
August	28.3 °C	22.9 °C	25.4 °C	37.6 °C	15.9 °C	28	8	0
September	24.7 °C	19.3 °C	21.8 °C	36.5 °C	11.0 °C	13	2	0
October	19.0 °C	13.5 °C	16.1 °C	29.8 °C	5.5 °C	1	0	0
November	13.1 °C	7.9 °C	10.3 °C	23.3 °C	-0.4 °C	0	0	0
December	7.4 °C	3.0 °C	5.1 °C	20.2 °C	-5.5 °C	0	0	3

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	178 mm	24	9.8 h/day	76 %	75 %	22 km/h	12.3 °C
February	119 mm	19	11 h/day	73 %	74 %	21 km/h	10.4 °C
March	119 mm	18	12 h/day	68 %	71 %	20 km/h	9.7 °C
April	93 mm	13	13 h/day	61 %	73 %	19 km/h	10.9 °C
May	95 mm	12	14 h/day	64 %	77 %	17 km/h	14.5 °C
June	122 mm	12	15 h/day	72 %	81 %	15 km/h	19.3 °C
July	213 mm	16	15 h/day	73 %	85 %	14 km/h	23.1 °C
August	151 mm	13	14 h/day	62 %	82 %	14 km/h	26.3 °C
September	142 mm	14	12 h/day	67 %	78 %	15 km/h	25.1 °C
October	147 mm	15	11 h/day	63 %	75 %	17 km/h	21.6 °C
November	157 mm	18	10 h/day	66 %	75 %	19 km/h	18.2 °C
December	190 mm	23	9.6 h/day	74 %	75 %	22 km/h	15.1 °C

How Niigata 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
Niigata	28 °C	-0.09 °C	1,727 mm	70
Nagaoka · Japan	30 °C	-2.7 °C	1,747 mm	96
Jōetsu · Japan	29 °C	-0.6 °C	2,259 mm	86
Yamagata · Japan	27 °C	-5.5 °C	1,438 mm	58
Fukushima · Japan	28 °C	-3.6 °C	1,358 mm	74
Kōriyama · Japan	28 °C	-3.4 °C	1,232 mm	70

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

QuestionsCommon questions about Niigata’s climate

When is the best time to visit Niigata?

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

How hot does Niigata get?

In August, the warmest month, daily highs average 28 °C. About 13 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average -0.09 °C in February, the coldest month. A normal year has 38 nights below freezing.

Which month is wettest in Niigata?

July, averaging 213 mm over 16 days with rain. The driest month is April with 93 mm. The year as a whole averages 1,727 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 Niigata 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: 37.923°, 139.041° (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.