Suzhou climate

Name: Suzhou
Address: CN

Suzhou is warmest in July, with average highs of 32 °C, and coldest in January, when nights average 0.8 °C. June is the wettest month (271 mm) and December the driest (53 mm). Figures are 1991–2020 climate normals.

Across a full year Suzhou averages 1,418 mm of rain, 135 days above 25 °C and 29 days below freezing.

China · population 6,715,559 · 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 July 32 °C
Coldest month January 0.8 °C
Driest month December 53 mm
Wettest month June 271 mm
Least cloud December 49 % cloud
Hottest on record July 40 °C
Coldest on record January -8.4 °C

What to expectSuzhou through the year

Suzhou has a clear annual cycle: average daily highs run from 7.9 °C in January to 32 °C in July, a swing of 24 °C in mean temperature across the year.

Counted across a normal year, 135 days a year reach 25 °C, 58 of them reach 30 °C, 29 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in July.

Rain is strongly seasonal. June averages 271 mm against 53 mm in December — 5.1 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	7.9 °C	76 mm	58 %
February	10.2 °C	80 mm	62 %
March	14.4 °C	115 mm	66 %
April	20.2 °C	119 mm	66 %
May	25.1 °C	142 mm	67 %
June	27.9 °C	271 mm	77 %
July	31.6 °C	171 mm	69 %
August	31.3 °C	164 mm	61 %
September	27.3 °C	97 mm	56 %
October	22.5 °C	62 mm	50 %
November	16.7 °C	67 mm	51 %
December	10.2 °C	53 mm	49 %

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	0.8 °C	4.3 °C	20.6 °C	-8.4 °C	0	0	13
February	10.2 °C	2.6 °C	6.3 °C	24.7 °C	-6.7 °C	0	0	7
March	14.4 °C	6.6 °C	10.3 °C	27.6 °C	-4.6 °C	0	0	1
April	20.2 °C	12.2 °C	15.8 °C	31.6 °C	0.9 °C	4	0	0
May	25.1 °C	17.5 °C	20.9 °C	36.2 °C	8.7 °C	16	2	0
June	27.9 °C	21.6 °C	24.4 °C	35.9 °C	15.4 °C	24	7	0
July	31.6 °C	25.8 °C	28.4 °C	40.0 °C	17.7 °C	30	22	0
August	31.3 °C	25.5 °C	28.0 °C	39.3 °C	18.7 °C	30	21	0
September	27.3 °C	21.1 °C	23.9 °C	36.2 °C	14.2 °C	24	5	0
October	22.5 °C	15.5 °C	18.7 °C	31.6 °C	6.5 °C	6	0	0
November	16.7 °C	9.6 °C	12.9 °C	27.9 °C	-3.6 °C	0	0	0
December	10.2 °C	3.0 °C	6.5 °C	21.2 °C	-7.1 °C	0	0	8

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	76 mm	9	10 h/day	58 %	74 %	18 km/h
February	80 mm	9	11 h/day	62 %	74 %	19 km/h
March	115 mm	12	12 h/day	66 %	74 %	21 km/h
April	119 mm	11	13 h/day	66 %	73 %	21 km/h
May	142 mm	11	14 h/day	67 %	75 %	20 km/h
June	271 mm	14	14 h/day	77 %	81 %	19 km/h
July	171 mm	14	14 h/day	69 %	81 %	18 km/h
August	164 mm	14	13 h/day	61 %	80 %	19 km/h
September	97 mm	10	12 h/day	56 %	78 %	18 km/h
October	62 mm	6	11 h/day	50 %	74 %	18 km/h
November	67 mm	8	11 h/day	51 %	74 %	18 km/h
December	53 mm	6	10 h/day	49 %	73 %	18 km/h

How Suzhou 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
Suzhou	32 °C	0.8 °C	1,418 mm	135
Kunshan · China	32 °C	0.4 °C	1,299 mm	136
Changshu · China	32 °C	-0.2 °C	1,283 mm	138
Wuxi · China	31 °C	0.05 °C	1,354 mm	137
Qingpu · China	32 °C	0.6 °C	1,341 mm	136
Jiaxing · China	32 °C	0.9 °C	1,458 mm	136
Songjiang · China	32 °C	0.8 °C	1,371 mm	136

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

QuestionsCommon questions about Suzhou’s climate

When is the best time to visit Suzhou?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, September, October sit closest to 20 °C on average, July is the warmest month and December the driest. The month-by-month table above has the full picture.

How hot does Suzhou get?

In July, the warmest month, daily highs average 32 °C. About 58 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 0.8 °C in January, the coldest month. A normal year has 29 nights below freezing.

Which month is wettest in Suzhou?

June, averaging 271 mm over 14 days with rain. The driest month is December with 53 mm. The year as a whole averages 1,418 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 Suzhou 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
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.