Nanjing climate

Name: Nanjing
Address: CN

Nanjing is warmest in July, with average highs of 31 °C, and coldest in January, when nights average -1.3 °C. June is the wettest month (226 mm) and December the driest (33 mm). Figures are 1991–2020 climate normals.

Across a full year Nanjing averages 1,227 mm of rain, 138 days above 25 °C and 49 days below freezing.

China · population 9,314,685 · 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 31 °C
Coldest month January -1.3 °C
Driest month December 33 mm
Wettest month June 226 mm
Least cloud December 48 % cloud
Hottest on record August 38 °C
Coldest on record January -13 °C

What to expectNanjing through the year

Nanjing has a clear annual cycle: average daily highs run from 7.6 °C in January to 31 °C in July, a swing of 25 °C in mean temperature across the year.

Counted across a normal year, 138 days a year reach 25 °C, 61 of them reach 30 °C, 49 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in August.

Rain is strongly seasonal. June averages 226 mm against 33 mm in December — 6.8 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	7.6 °C	55 mm	56 %
February	10.2 °C	55 mm	61 %
March	14.9 °C	80 mm	66 %
April	20.9 °C	91 mm	65 %
May	25.6 °C	118 mm	67 %
June	28.5 °C	226 mm	73 %
July	31.4 °C	206 mm	71 %
August	30.9 °C	173 mm	62 %
September	27.1 °C	83 mm	57 %
October	22.2 °C	53 mm	51 %
November	16.2 °C	53 mm	49 %
December	9.8 °C	33 mm	48 %

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	7.6 °C	-1.3 °C	3.0 °C	21.6 °C	-13.2 °C	0	0	20
February	10.2 °C	0.9 °C	5.5 °C	26.4 °C	-11.8 °C	0	0	12
March	14.9 °C	5.4 °C	10.0 °C	27.9 °C	-5.7 °C	1	0	2
April	20.9 °C	11.4 °C	15.9 °C	35.0 °C	0.2 °C	6	0	0
May	25.6 °C	16.7 °C	21.0 °C	36.1 °C	7.4 °C	18	4	0
June	28.5 °C	21.0 °C	24.5 °C	37.3 °C	13.5 °C	25	10	0
July	31.4 °C	24.9 °C	27.9 °C	37.7 °C	17.2 °C	30	22	0
August	30.9 °C	24.4 °C	27.3 °C	38.1 °C	16.9 °C	30	20	0
September	27.1 °C	19.7 °C	23.1 °C	36.5 °C	10.4 °C	23	5	0
October	22.2 °C	13.7 °C	17.6 °C	31.4 °C	3.8 °C	6	0	0
November	16.2 °C	7.3 °C	11.5 °C	27.7 °C	-6.1 °C	1	0	1
December	9.8 °C	0.8 °C	5.1 °C	21.1 °C	-11.9 °C	0	0	14

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	55 mm	8	10 h/day	56 %	73 %	14 km/h
February	55 mm	8	11 h/day	61 %	72 %	16 km/h
March	80 mm	9	12 h/day	66 %	71 %	17 km/h
April	91 mm	9	13 h/day	65 %	72 %	17 km/h
May	118 mm	10	14 h/day	67 %	73 %	16 km/h
June	226 mm	12	14 h/day	73 %	78 %	15 km/h
July	206 mm	15	14 h/day	71 %	82 %	14 km/h
August	173 mm	14	13 h/day	62 %	82 %	15 km/h
September	83 mm	8	12 h/day	57 %	78 %	14 km/h
October	53 mm	6	11 h/day	51 %	73 %	14 km/h
November	53 mm	6	11 h/day	49 %	73 %	14 km/h
December	33 mm	5	10 h/day	48 %	72 %	14 km/h

How Nanjing 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
Nanjing	31 °C	-1.3 °C	1,227 mm	138
Ma’anshan · China	32 °C	-0.7 °C	1,267 mm	140
Chuzhou · China	31 °C	-1.7 °C	1,177 mm	139
Zhenjiang · China	31 °C	-1.2 °C	1,230 mm	134
Wuhu · China	32 °C	-0.3 °C	1,358 mm	144
Changzhou · China	31 °C	-0.5 °C	1,258 mm	138
Taizhou · China	31 °C	-1.5 °C	1,201 mm	136

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

QuestionsCommon questions about Nanjing’s climate

When is the best time to visit Nanjing?

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 Nanjing get?

In July, the warmest month, daily highs average 31 °C. About 61 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 -1.3 °C in January, the coldest month. A normal year has 49 nights below freezing.

Which month is wettest in Nanjing?

June, averaging 226 mm over 12 days with rain. The driest month is December with 33 mm. The year as a whole averages 1,227 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 Nanjing 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: 32.062°, 118.778° (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.