Geoje climate

Name: Geoje
Address: KR

Geoje is warmest in August, with average highs of 27 °C, and coldest in January, when nights average 1.6 °C. July is the wettest month (242 mm) and December the driest (30 mm). Figures are 1991–2020 climate normals.

Across a full year Geoje averages 1,349 mm of rain, 52 days above 25 °C and 23 days below freezing.

South Korea · population 232,921 · 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 1.6 °C
Driest month December 30 mm
Wettest month July 242 mm
Least cloud December 37 % cloud
Hottest on record August 34 °C
Coldest on record January -10 °C
Warmest sea August 26 °C

What to expectGeoje through the year

Geoje has a clear annual cycle: average daily highs run from 6.5 °C in January to 27 °C in August, a swing of 21 °C in mean temperature across the year.

Counted across a normal year, 52 days a year reach 25 °C, 2 of them reach 30 °C, 23 nights drop below freezing. The warmest reading in the 1991–2020 record is 34 °C, in August.

Rain is strongly seasonal. July averages 242 mm against 30 mm in December — 8.0 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Geoje is warmest in August at 26 °C and coldest in February at 14 °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	6.5 °C	34 mm	43 %
February	8.0 °C	45 mm	47 %
March	11.1 °C	85 mm	53 %
April	14.8 °C	120 mm	55 %
May	18.3 °C	122 mm	59 %
June	21.5 °C	181 mm	70 %
July	25.0 °C	242 mm	71 %
August	26.9 °C	203 mm	61 %
September	24.1 °C	168 mm	58 %
October	19.7 °C	69 mm	43 %
November	14.3 °C	50 mm	40 %
December	8.6 °C	30 mm	37 %

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	6.5 °C	1.6 °C	4.2 °C	16.7 °C	-10.2 °C	0	0	10
February	8.0 °C	2.9 °C	5.6 °C	16.8 °C	-7.8 °C	0	0	7
March	11.1 °C	6.4 °C	8.9 °C	19.7 °C	-3.0 °C	0	0	1
April	14.8 °C	11.0 °C	12.9 °C	23.0 °C	2.6 °C	0	0	0
May	18.3 °C	15.1 °C	16.7 °C	29.6 °C	9.5 °C	0	0	0
June	21.5 °C	18.8 °C	20.1 °C	28.8 °C	14.0 °C	1	0	0
July	25.0 °C	22.7 °C	23.8 °C	33.9 °C	17.1 °C	14	1	0
August	26.9 °C	24.3 °C	25.5 °C	34.1 °C	18.8 °C	26	1	0
September	24.1 °C	21.0 °C	22.5 °C	29.0 °C	14.5 °C	9	0	0
October	19.7 °C	15.8 °C	17.8 °C	26.4 °C	4.5 °C	0	0	0
November	14.3 °C	9.7 °C	12.1 °C	21.2 °C	-1.7 °C	0	0	0
December	8.6 °C	3.8 °C	6.4 °C	17.7 °C	-7.3 °C	0	0	5

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	34 mm	4	10 h/day	43 %	59 %	21 km/h	14.8 °C
February	45 mm	5	11 h/day	47 %	59 %	21 km/h	13.6 °C
March	85 mm	7	12 h/day	53 %	65 %	22 km/h	13.6 °C
April	120 mm	8	13 h/day	55 %	73 %	22 km/h	14.5 °C
May	122 mm	8	14 h/day	59 %	81 %	20 km/h	16.5 °C
June	181 mm	10	14 h/day	70 %	87 %	19 km/h	20.0 °C
July	242 mm	14	14 h/day	71 %	90 %	21 km/h	23.3 °C
August	203 mm	13	13 h/day	61 %	86 %	20 km/h	26.2 °C
September	168 mm	10	12 h/day	58 %	77 %	20 km/h	24.6 °C
October	69 mm	5	11 h/day	43 %	68 %	19 km/h	21.7 °C
November	50 mm	5	10 h/day	40 %	64 %	19 km/h	19.1 °C
December	30 mm	3	9.8 h/day	37 %	60 %	21 km/h	16.8 °C

How Geoje 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
Geoje	27 °C	1.6 °C	1,349 mm	52
Busan · South Korea	28 °C	-0.06 °C	1,329 mm	62
Changwon · South Korea	29 °C	-1.5 °C	1,323 mm	92
Chinju · South Korea	29 °C	-3.7 °C	1,432 mm	105
Gwangyang · South Korea	29 °C	-2.5 °C	1,527 mm	95
Yeosu · South Korea	28 °C	-0.2 °C	1,406 mm	67
Ulsan · South Korea	28 °C	-1.4 °C	1,246 mm	81

Where Geoje ranks

Ranking	Position	Value
The coolest places in Asia in June	21stof 50	21 °C
The coolest places in Asia in May	28thof 50	18 °C

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

QuestionsCommon questions about Geoje’s climate

When is the best time to visit Geoje?

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

In August, the warmest month, daily highs average 27 °C. About 2 days a year pass 30 °C. The highest value in the 1991–2020 record is 34 °C.

How cold does it get in winter?

Nights average 1.6 °C in January, the coldest month. A normal year has 23 nights below freezing.

Which month is wettest in Geoje?

July, averaging 242 mm over 14 days with rain. The driest month is December with 30 mm. The year as a whole averages 1,349 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 Geoje 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.