Yeosu climate

Name: Yeosu
Address: KR

Yeosu is warmest in August, with average highs of 28 °C, and coldest in January, when nights average -0.2 °C. July is the wettest month (267 mm) and December the driest (30 mm). Figures are 1991–2020 climate normals.

Across a full year Yeosu averages 1,406 mm of rain, 67 days above 25 °C and 38 days below freezing.

South Korea · population 268,823 · 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 -0.2 °C
Driest month December 30 mm
Wettest month July 267 mm
Least cloud December 43 % cloud
Hottest on record August 35 °C
Coldest on record January -10 °C
Warmest sea August 26 °C

What to expectYeosu through the year

Yeosu has a clear annual cycle: average daily highs run from 5.7 °C in January to 28 °C in August, a swing of 23 °C in mean temperature across the year.

Counted across a normal year, 67 days a year reach 25 °C, 5 of them reach 30 °C, 38 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in August.

Rain is strongly seasonal. July averages 267 mm against 30 mm in December — 9.1 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Yeosu is warmest in August at 26 °C and coldest in February at 12 °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	5.7 °C	33 mm	50 %
February	7.6 °C	45 mm	52 %
March	11.3 °C	82 mm	54 %
April	15.8 °C	121 mm	56 %
May	20.0 °C	136 mm	60 %
June	23.0 °C	198 mm	71 %
July	26.2 °C	267 mm	72 %
August	27.7 °C	230 mm	62 %
September	24.6 °C	153 mm	58 %
October	19.9 °C	64 mm	43 %
November	13.8 °C	47 mm	43 %
December	7.8 °C	30 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	5.7 °C	-0.2 °C	2.5 °C	16.8 °C	-10.3 °C	0	0	16
February	7.6 °C	1.0 °C	4.0 °C	16.2 °C	-9.0 °C	0	0	11
March	11.3 °C	4.8 °C	7.8 °C	21.1 °C	-3.5 °C	0	0	2
April	15.8 °C	9.7 °C	12.6 °C	24.7 °C	1.9 °C	0	0	0
May	20.0 °C	14.5 °C	17.1 °C	32.8 °C	8.2 °C	1	0	0
June	23.0 °C	18.7 °C	20.7 °C	31.3 °C	13.5 °C	4	0	0
July	26.2 °C	22.7 °C	24.2 °C	34.0 °C	16.5 °C	21	2	0
August	27.7 °C	23.8 °C	25.6 °C	35.1 °C	18.4 °C	28	3	0
September	24.6 °C	19.9 °C	22.1 °C	30.5 °C	13.0 °C	13	0	0
October	19.9 °C	14.2 °C	16.8 °C	27.2 °C	3.2 °C	0	0	0
November	13.8 °C	7.8 °C	10.6 °C	22.5 °C	-3.0 °C	0	0	0
December	7.8 °C	1.9 °C	4.7 °C	18.2 °C	-7.3 °C	0	0	9

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	33 mm	4	10 h/day	50 %	64 %	23 km/h	12.8 °C
February	45 mm	5	11 h/day	52 %	63 %	22 km/h	11.8 °C
March	82 mm	7	12 h/day	54 %	68 %	22 km/h	11.9 °C
April	121 mm	8	13 h/day	56 %	72 %	22 km/h	13.0 °C
May	136 mm	8	14 h/day	60 %	78 %	20 km/h	15.9 °C
June	198 mm	10	14 h/day	71 %	85 %	18 km/h	19.6 °C
July	267 mm	15	14 h/day	72 %	89 %	19 km/h	22.9 °C
August	230 mm	14	13 h/day	62 %	86 %	19 km/h	25.6 °C
September	153 mm	9	12 h/day	58 %	78 %	19 km/h	24.2 °C
October	64 mm	5	11 h/day	43 %	71 %	19 km/h	20.8 °C
November	47 mm	5	10 h/day	43 %	69 %	20 km/h	17.1 °C
December	30 mm	4	9.8 h/day	43 %	65 %	22 km/h	14.3 °C

How Yeosu 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
Yeosu	28 °C	-0.2 °C	1,406 mm	67
Gwangyang · South Korea	29 °C	-2.5 °C	1,527 mm	95
Suncheon · South Korea	29 °C	-2.2 °C	1,520 mm	106
Chinju · South Korea	29 °C	-3.7 °C	1,432 mm	105
Gwangju · South Korea	29 °C	-3.0 °C	1,246 mm	107
Geoje · South Korea	27 °C	1.6 °C	1,349 mm	52
Changwon · South Korea	29 °C	-1.5 °C	1,323 mm	92

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

QuestionsCommon questions about Yeosu’s climate

When is the best time to visit Yeosu?

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

How hot does Yeosu get?

In August, the warmest month, daily highs average 28 °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 -0.2 °C in January, the coldest month. A normal year has 38 nights below freezing.

Which month is wettest in Yeosu?

July, averaging 267 mm over 15 days with rain. The driest month is December with 30 mm. The year as a whole averages 1,406 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 Yeosu 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: 34.761°, 127.662° (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.