Icheon-si climate

Name: Icheon-si
Address: KR

Icheon-si is warmest in August, with average highs of 29 °C, and coldest in January, when nights average -6.5 °C. July is the wettest month (307 mm) and January the driest (22 mm). Figures are 1991–2020 climate normals.

Across a full year Icheon-si averages 1,232 mm of rain, 103 days above 25 °C and 113 days below freezing.

South Korea · population 196,230 · 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 29 °C
Coldest month January -6.5 °C
Driest month January 22 mm
Wettest month July 307 mm
Least cloud December 43 % cloud
Hottest on record August 40 °C
Coldest on record January -23 °C

What to expectIcheon-si through the year

Icheon-si has a clear annual cycle: average daily highs run from 1.9 °C in January to 29 °C in August, a swing of 28 °C in mean temperature across the year.

Counted across a normal year, 103 days a year reach 25 °C, 25 of them reach 30 °C, 113 nights drop below freezing. The warmest reading in the 1991–2020 record is 40 °C, in August.

Rain is strongly seasonal. July averages 307 mm against 22 mm in January — 14 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	1.9 °C	22 mm	46 %
February	4.9 °C	30 mm	47 %
March	10.5 °C	45 mm	51 %
April	17.3 °C	81 mm	52 %
May	22.8 °C	98 mm	56 %
June	27.1 °C	133 mm	66 %
July	28.5 °C	307 mm	75 %
August	28.9 °C	256 mm	68 %
September	24.7 °C	131 mm	59 %
October	18.8 °C	60 mm	46 %
November	10.8 °C	46 mm	47 %
December	3.7 °C	25 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	1.9 °C	-6.5 °C	-2.5 °C	13.9 °C	-23.5 °C	0	0	30
February	4.9 °C	-4.1 °C	-0.1 °C	18.4 °C	-19.6 °C	0	0	25
March	10.5 °C	0.1 °C	4.9 °C	21.9 °C	-13.6 °C	0	0	17
April	17.3 °C	5.8 °C	11.3 °C	30.0 °C	-2.9 °C	1	0	2
May	22.8 °C	11.8 °C	17.0 °C	33.4 °C	4.3 °C	8	0	0
June	27.1 °C	17.4 °C	21.9 °C	36.4 °C	8.9 °C	23	4	0
July	28.5 °C	21.5 °C	24.6 °C	37.0 °C	13.5 °C	28	8	0
August	28.9 °C	21.7 °C	25.0 °C	39.6 °C	12.3 °C	28	11	0
September	24.7 °C	16.0 °C	20.2 °C	32.0 °C	6.5 °C	14	1	0
October	18.8 °C	8.8 °C	13.5 °C	26.9 °C	-2.2 °C	1	0	0
November	10.8 °C	1.8 °C	6.0 °C	24.0 °C	-13.3 °C	0	0	11
December	3.7 °C	-4.5 °C	-0.7 °C	14.7 °C	-19.6 °C	0	0	28

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	22 mm	4	9.9 h/day	46 %	60 %	15 km/h
February	30 mm	4	11 h/day	47 %	60 %	15 km/h
March	45 mm	6	12 h/day	51 %	65 %	16 km/h
April	81 mm	7	13 h/day	52 %	65 %	16 km/h
May	98 mm	8	14 h/day	56 %	69 %	15 km/h
June	133 mm	9	15 h/day	66 %	72 %	13 km/h
July	307 mm	17	14 h/day	75 %	82 %	13 km/h
August	256 mm	16	14 h/day	68 %	82 %	12 km/h
September	131 mm	9	12 h/day	59 %	77 %	11 km/h
October	60 mm	5	11 h/day	46 %	72 %	12 km/h
November	46 mm	7	10 h/day	47 %	70 %	13 km/h
December	25 mm	5	9.6 h/day	43 %	63 %	14 km/h

How Icheon-si 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
Icheon-si	29 °C	-6.5 °C	1,232 mm	103
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
Pyeongtaek · South Korea	29 °C	-5.4 °C	1,132 mm	106
Gunpo · South Korea	28 °C	-6.1 °C	1,139 mm	85
Wŏnju · South Korea	28 °C	-7.3 °C	1,222 mm	96

Planning a trip? See the best time to visit Icheon-si.

QuestionsCommon questions about Icheon-si’s climate

When is the best time to visit Icheon-si?

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 Icheon-si get?

In August, the warmest month, daily highs average 29 °C. About 25 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 -6.5 °C in January, the coldest month. A normal year has 113 nights below freezing.

Which month is wettest in Icheon-si?

July, averaging 307 mm over 17 days with rain. The driest month is January with 22 mm. The year as a whole averages 1,232 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 Icheon-si 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: 37.279°, 127.442° (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.