Dandong climate

Name: Dandong
Address: CN

Dandong is warmest in August, with average highs of 28 °C, and coldest in January, when nights average -12 °C. July is the wettest month (228 mm) and January the driest (9.2 mm). Figures are 1991–2020 climate normals.

Across a full year Dandong averages 978 mm of rain, 77 days above 25 °C and 139 days below freezing.

China · population 631,973 · 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 January -12 °C
Driest month January 9 mm
Wettest month July 228 mm
Least cloud January 32 % cloud
Hottest on record August 37 °C
Coldest on record January -31 °C
Warmest sea August 24 °C

What to expectDandong through the year

Dandong has a clear annual cycle: average daily highs run from -1.9 °C in January to 28 °C in August, a swing of 31 °C in mean temperature across the year.

Counted across a normal year, 77 days a year reach 25 °C, 8 of them reach 30 °C, 139 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in August.

Rain is strongly seasonal. July averages 228 mm against 9 mm in January — 25 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Dandong is warmest in August at 24 °C and coldest in February at 0.8 °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	-1.9 °C	9 mm	32 %
February	2.0 °C	19 mm	37 %
March	8.0 °C	27 mm	44 %
April	14.7 °C	56 mm	50 %
May	20.3 °C	89 mm	54 %
June	24.6 °C	117 mm	65 %
July	27.0 °C	228 mm	74 %
August	27.5 °C	227 mm	65 %
September	23.7 °C	84 mm	50 %
October	16.5 °C	55 mm	41 %
November	7.5 °C	46 mm	42 %
December	-0.0 °C	20 mm	34 %

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	-1.9 °C	-12.2 °C	-7.1 °C	8.3 °C	-31.4 °C	0	0	31
February	2.0 °C	-8.0 °C	-3.3 °C	13.5 °C	-27.1 °C	0	0	27
March	8.0 °C	-2.4 °C	2.3 °C	19.9 °C	-14.8 °C	0	0	25
April	14.7 °C	4.0 °C	9.0 °C	24.5 °C	-5.0 °C	0	0	5
May	20.3 °C	10.3 °C	15.1 °C	30.0 °C	2.0 °C	2	0	0
June	24.6 °C	16.2 °C	20.1 °C	33.8 °C	9.2 °C	13	1	0
July	27.0 °C	20.6 °C	23.5 °C	34.9 °C	14.3 °C	24	3	0
August	27.5 °C	20.5 °C	23.7 °C	36.9 °C	11.1 °C	27	3	0
September	23.7 °C	14.6 °C	18.9 °C	32.4 °C	3.8 °C	10	0	0
October	16.5 °C	6.7 °C	11.4 °C	28.9 °C	-4.3 °C	0	0	2
November	7.5 °C	-1.1 °C	3.0 °C	19.0 °C	-14.3 °C	0	0	19
December	-0.0 °C	-8.8 °C	-4.5 °C	11.2 °C	-29.3 °C	0	0	30

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	9 mm	2	9.6 h/day	32 %	53 %	15 km/h	2.1 °C
February	19 mm	3	11 h/day	37 %	53 %	17 km/h	0.8 °C
March	27 mm	5	12 h/day	44 %	58 %	18 km/h	2.3 °C
April	56 mm	7	13 h/day	50 %	65 %	18 km/h	7.2 °C
May	89 mm	8	14 h/day	54 %	72 %	16 km/h	12.8 °C
June	117 mm	11	15 h/day	65 %	79 %	14 km/h	18.0 °C
July	228 mm	15	15 h/day	74 %	85 %	14 km/h	21.9 °C
August	227 mm	14	14 h/day	65 %	83 %	13 km/h	24.1 °C
September	84 mm	7	12 h/day	50 %	74 %	14 km/h	22.6 °C
October	55 mm	6	11 h/day	41 %	68 %	16 km/h	17.6 °C
November	46 mm	6	10.0 h/day	42 %	63 %	16 km/h	11.6 °C
December	20 mm	4	9.3 h/day	34 %	55 %	15 km/h	5.9 °C

How Dandong 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
Dandong	28 °C	-12 °C	978 mm	77
Kaech’ŏn · North Korea	28 °C	-13 °C	1,290 mm	90
Benxi · China	28 °C	-17 °C	873 mm	81
Sunch’ŏn · North Korea	28 °C	-12 °C	1,230 mm	88
Haicheng · China	29 °C	-14 °C	676 mm	103
Anshan · China	29 °C	-14 °C	721 mm	102
Tŏkch’ŏn · North Korea	27 °C	-15 °C	1,409 mm	75

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

QuestionsCommon questions about Dandong’s climate

When is the best time to visit Dandong?

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

How hot does Dandong get?

In August, the warmest month, daily highs average 28 °C. About 8 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average -12 °C in January, the coldest month. A normal year has 139 nights below freezing.

Which month is wettest in Dandong?

July, averaging 228 mm over 15 days with rain. The driest month is January with 9 mm. The year as a whole averages 978 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 Dandong 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: 40.129°, 124.395° (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.