Wŏnju climate

Name: Wŏnju
Address: KR

Wŏnju is warmest in August, with average highs of 28 °C, and coldest in January, when nights average -7.3 °C. July is the wettest month (292 mm) and January the driest (24 mm). Figures are 1991–2020 climate normals.

Across a full year Wŏnju averages 1,222 mm of rain, 96 days above 25 °C and 113 days below freezing.

South Korea · population 332,849 · 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 -7.3 °C
Driest month January 24 mm
Wettest month July 292 mm
Least cloud December 43 % cloud
Hottest on record August 38 °C
Coldest on record December -25 °C

What to expectWŏnju through the year

Wŏnju has a clear annual cycle: average daily highs run from 1.4 °C in January to 28 °C in August, a swing of 28 °C in mean temperature across the year.

Counted across a normal year, 96 days a year reach 25 °C, 19 of them reach 30 °C, 113 nights drop below freezing. The warmest reading in the 1991–2020 record is 38 °C, in August.

Rain is strongly seasonal. July averages 292 mm against 24 mm in January — 12 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	1.4 °C	24 mm	45 %
February	4.6 °C	34 mm	48 %
March	10.2 °C	52 mm	53 %
April	16.9 °C	86 mm	54 %
May	22.3 °C	102 mm	57 %
June	26.5 °C	134 mm	66 %
July	28.0 °C	292 mm	76 %
August	28.5 °C	233 mm	69 %
September	24.2 °C	131 mm	60 %
October	18.3 °C	59 mm	47 %
November	10.3 °C	46 mm	47 %
December	3.2 °C	28 mm	43 %

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	1.4 °C	-7.3 °C	-3.0 °C	11.8 °C	-25.1 °C	0	0	30
February	4.6 °C	-4.5 °C	-0.3 °C	17.9 °C	-22.9 °C	0	0	25
March	10.2 °C	0.0 °C	4.8 °C	21.8 °C	-13.6 °C	0	0	16
April	16.9 °C	5.5 °C	11.1 °C	29.7 °C	-4.1 °C	0	0	2
May	22.3 °C	11.3 °C	16.8 °C	32.4 °C	3.7 °C	7	0	0
June	26.5 °C	16.7 °C	21.5 °C	35.2 °C	8.8 °C	22	2	0
July	28.0 °C	20.8 °C	24.2 °C	35.7 °C	12.6 °C	27	6	0
August	28.5 °C	21.0 °C	24.5 °C	38.3 °C	10.2 °C	28	10	0
September	24.2 °C	15.2 °C	19.7 °C	31.6 °C	5.5 °C	12	0	0
October	18.3 °C	8.1 °C	13.2 °C	26.8 °C	-3.8 °C	0	0	1
November	10.3 °C	1.5 °C	5.7 °C	23.9 °C	-12.6 °C	0	0	12
December	3.2 °C	-4.9 °C	-1.0 °C	14.3 °C	-25.2 °C	0	0	28

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	24 mm	4	9.9 h/day	45 %	59 %	14 km/h
February	34 mm	5	11 h/day	48 %	58 %	15 km/h
March	52 mm	7	12 h/day	53 %	63 %	16 km/h
April	86 mm	8	13 h/day	54 %	65 %	16 km/h
May	102 mm	9	14 h/day	57 %	69 %	14 km/h
June	134 mm	10	15 h/day	66 %	73 %	11 km/h
July	292 mm	18	14 h/day	76 %	83 %	12 km/h
August	233 mm	16	14 h/day	69 %	82 %	12 km/h
September	131 mm	9	12 h/day	60 %	77 %	11 km/h
October	59 mm	5	11 h/day	47 %	72 %	12 km/h
November	46 mm	7	10 h/day	47 %	70 %	13 km/h
December	28 mm	5	9.6 h/day	43 %	63 %	13 km/h

How Wŏnju 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
Wŏnju	28 °C	-7.3 °C	1,222 mm	96
Chungju · South Korea	29 °C	-6.2 °C	1,173 mm	101
Icheon-si · South Korea	29 °C	-6.5 °C	1,232 mm	103
Chuncheon · South Korea	28 °C	-8.0 °C	1,226 mm	92
Seongnam-si · South Korea	28 °C	-6.6 °C	1,294 mm	95
Osan · South Korea	29 °C	-5.8 °C	1,148 mm	100
Suwon · South Korea	28 °C	-6.2 °C	1,146 mm	93

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

QuestionsCommon questions about Wŏnju’s climate

When is the best time to visit Wŏnju?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, June, 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 Wŏnju get?

In August, the warmest month, daily highs average 28 °C. About 19 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 -7.3 °C in January, the coldest month. A normal year has 113 nights below freezing.

Which month is wettest in Wŏnju?

July, averaging 292 mm over 18 days with rain. The driest month is January with 24 mm. The year as a whole averages 1,222 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 Wŏnju 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.