Zhoushan climate

Name: Zhoushan
Address: CN

Zhoushan is warmest in August, with average highs of 29 °C, and coldest in January, when nights average 5.6 °C. June is the wettest month (258 mm) and December the driest (67 mm). Figures are 1991–2020 climate normals.

Across a full year Zhoushan averages 1,339 mm of rain, 97 days above 25 °C and 1 days below freezing.

China · population 882,932 · 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 5.6 °C
Driest month December 67 mm
Wettest month June 258 mm
Least cloud October 53 % cloud
Hottest on record August 35 °C
Coldest on record January -4.2 °C
Warmest sea August 27 °C

What to expectZhoushan through the year

Zhoushan has a clear annual cycle: average daily highs run from 8.8 °C in January to 29 °C in August, a swing of 20 °C in mean temperature across the year.

Counted across a normal year, 97 days a year reach 25 °C, 9 of them reach 30 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in August.

Rain is strongly seasonal. June averages 258 mm against 67 mm in December — 3.9 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Zhoushan is warmest in August at 27 °C and coldest in February at 10 °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	8.8 °C	72 mm	64 %
February	9.2 °C	72 mm	63 %
March	11.8 °C	117 mm	67 %
April	16.0 °C	116 mm	68 %
May	20.8 °C	137 mm	70 %
June	24.5 °C	258 mm	82 %
July	28.2 °C	104 mm	66 %
August	28.9 °C	119 mm	58 %
September	26.3 °C	133 mm	58 %
October	22.1 °C	75 mm	53 %
November	17.5 °C	71 mm	58 %
December	11.8 °C	67 mm	56 %

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	8.8 °C	5.6 °C	7.4 °C	19.5 °C	-4.2 °C	0	0	1
February	9.2 °C	6.0 °C	7.7 °C	23.4 °C	-0.7 °C	0	0	0
March	11.8 °C	8.6 °C	10.2 °C	21.1 °C	0.4 °C	0	0	0
April	16.0 °C	12.7 °C	14.3 °C	25.7 °C	4.5 °C	0	0	0
May	20.8 °C	17.9 °C	19.2 °C	29.5 °C	9.5 °C	1	0	0
June	24.5 °C	22.0 °C	23.2 °C	34.1 °C	15.2 °C	11	0	0
July	28.2 °C	25.8 °C	26.8 °C	34.1 °C	19.6 °C	29	3	0
August	28.9 °C	26.4 °C	27.5 °C	35.0 °C	22.0 °C	31	6	0
September	26.3 °C	23.8 °C	24.9 °C	32.6 °C	18.2 °C	22	1	0
October	22.1 °C	19.6 °C	20.8 °C	30.3 °C	11.5 °C	2	0	0
November	17.5 °C	14.6 °C	16.1 °C	24.0 °C	3.5 °C	0	0	0
December	11.8 °C	8.5 °C	10.3 °C	21.7 °C	-3.7 °C	0	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	72 mm	10	10 h/day	64 %	73 %	24 km/h	11.7 °C
February	72 mm	10	11 h/day	63 %	76 %	24 km/h	10.2 °C
March	117 mm	13	12 h/day	67 %	80 %	24 km/h	10.8 °C
April	116 mm	12	13 h/day	68 %	83 %	23 km/h	13.7 °C
May	137 mm	12	14 h/day	70 %	85 %	22 km/h	18.3 °C
June	258 mm	15	14 h/day	82 %	89 %	21 km/h	21.9 °C
July	104 mm	9	14 h/day	66 %	89 %	24 km/h	25.1 °C
August	119 mm	12	13 h/day	58 %	86 %	24 km/h	26.6 °C
September	133 mm	11	12 h/day	58 %	79 %	23 km/h	25.5 °C
October	75 mm	7	11 h/day	53 %	71 %	23 km/h	22.9 °C
November	71 mm	9	11 h/day	58 %	71 %	23 km/h	19.6 °C
December	67 mm	8	10 h/day	56 %	70 %	24 km/h	15.5 °C

How Zhoushan 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
Zhoushan	29 °C	5.6 °C	1,339 mm	97
Ningbo · China	32 °C	2.4 °C	1,586 mm	134
Cixi · China	32 °C	2.2 °C	1,426 mm	137
Fengxiang · China	30 °C	2.3 °C	1,310 mm	114
Nanqiao · China	31 °C	1.8 °C	1,315 mm	123
Shangyu · China	33 °C	1.3 °C	1,550 mm	147
Songjiang · China	32 °C	0.8 °C	1,371 mm	136

Where Zhoushan ranks

Ranking	Position	Value
Best beach destinations in Asia in July	30th of 50	88/100

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

QuestionsCommon questions about Zhoushan’s climate

When is the best time to visit Zhoushan?

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 Zhoushan get?

In August, the warmest month, daily highs average 29 °C. About 9 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 5.6 °C in January, the coldest month. A normal year has 1 nights below freezing.

Which month is wettest in Zhoushan?

June, averaging 258 mm over 15 days with rain. The driest month is December with 67 mm. The year as a whole averages 1,339 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 Zhoushan 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: 29.989°, 122.205° (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.