Haeju climate

Name: Haeju
Address: KP

Haeju is warmest in August, with average highs of 27 °C, and coldest in January, when nights average -6.5 °C. July is the wettest month (277 mm) and January the driest (15 mm). Figures are 1991–2020 climate normals.

Across a full year Haeju averages 1,064 mm of rain, 68 days above 25 °C and 107 days below freezing.

North Korea · population 222,396 · 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 27 °C
Coldest month January -6.5 °C
Driest month January 15 mm
Wettest month July 277 mm
Least cloud October 44 % cloud
Hottest on record August 35 °C
Coldest on record January -19 °C
Warmest sea August 25 °C

What to expectHaeju through the year

Haeju has a clear annual cycle: average daily highs run from 0.6 °C in January to 27 °C in August, a swing of 28 °C in mean temperature across the year.

Counted across a normal year, 68 days a year reach 25 °C, 5 of them reach 30 °C, 107 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in August.

Rain is strongly seasonal. July averages 277 mm against 15 mm in January — 18 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Haeju is warmest in August at 25 °C and coldest in February at 2.4 °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	0.6 °C	15 mm	50 %
February	3.0 °C	21 mm	46 %
March	8.0 °C	29 mm	47 %
April	14.1 °C	56 mm	49 %
May	19.4 °C	92 mm	54 %
June	23.8 °C	115 mm	63 %
July	26.2 °C	277 mm	73 %
August	27.4 °C	255 mm	64 %
September	23.8 °C	96 mm	54 %
October	17.7 °C	42 mm	44 %
November	9.8 °C	45 mm	48 %
December	2.8 °C	21 mm	50 %

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	0.6 °C	-6.5 °C	-3.0 °C	9.1 °C	-19.1 °C	0	0	30
February	3.0 °C	-4.5 °C	-0.9 °C	13.0 °C	-16.3 °C	0	0	26
March	8.0 °C	0.1 °C	3.8 °C	19.2 °C	-7.7 °C	0	0	16
April	14.1 °C	6.2 °C	10.0 °C	24.9 °C	-2.8 °C	0	0	0
May	19.4 °C	11.9 °C	15.5 °C	29.3 °C	4.8 °C	1	0	0
June	23.8 °C	17.3 °C	20.4 °C	30.9 °C	11.5 °C	9	0	0
July	26.2 °C	21.4 °C	23.6 °C	33.8 °C	16.3 °C	21	1	0
August	27.4 °C	22.1 °C	24.6 °C	35.3 °C	14.4 °C	27	3	0
September	23.8 °C	17.0 °C	20.3 °C	29.9 °C	8.7 °C	9	0	0
October	17.7 °C	10.1 °C	13.7 °C	27.4 °C	-1.4 °C	0	0	0
November	9.8 °C	2.8 °C	6.2 °C	21.0 °C	-10.7 °C	0	0	8
December	2.8 °C	-4.0 °C	-0.6 °C	12.4 °C	-16.2 °C	0	0	27

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	15 mm	3	9.8 h/day	50 %	64 %	19 km/h	3.7 °C
February	21 mm	3	11 h/day	46 %	63 %	19 km/h	2.4 °C
March	29 mm	5	12 h/day	47 %	67 %	19 km/h	4.6 °C
April	56 mm	6	13 h/day	49 %	70 %	19 km/h	8.8 °C
May	92 mm	7	14 h/day	54 %	74 %	17 km/h	13.4 °C
June	115 mm	8	15 h/day	63 %	79 %	16 km/h	17.7 °C
July	277 mm	15	15 h/day	73 %	87 %	17 km/h	21.6 °C
August	255 mm	14	14 h/day	64 %	84 %	16 km/h	24.5 °C
September	96 mm	7	12 h/day	54 %	76 %	15 km/h	23.0 °C
October	42 mm	5	11 h/day	44 %	71 %	17 km/h	18.3 °C
November	45 mm	7	10 h/day	48 %	71 %	18 km/h	12.8 °C
December	21 mm	4	9.5 h/day	50 %	67 %	19 km/h	7.6 °C

How Haeju 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
Haeju	27 °C	-6.5 °C	1,064 mm	68
Paech’ŏn-ŭp · North Korea	28 °C	-7.5 °C	1,140 mm	90
Sariwŏn-si · North Korea	28 °C	-8.3 °C	961 mm	99
Kaesŏng · North Korea	29 °C	-7.7 °C	1,180 mm	96
Namp’o · North Korea	28 °C	-7.8 °C	954 mm	94
Goyang-si · South Korea	28 °C	-7.2 °C	1,203 mm	91
Incheon · South Korea	28 °C	-6.1 °C	1,152 mm	71

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

QuestionsCommon questions about Haeju’s climate

When is the best time to visit Haeju?

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 Haeju get?

In August, the warmest month, daily highs average 27 °C. About 5 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 -6.5 °C in January, the coldest month. A normal year has 107 nights below freezing.

Which month is wettest in Haeju?

July, averaging 277 mm over 15 days with rain. The driest month is January with 15 mm. The year as a whole averages 1,064 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 Haeju 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.