Busan climate

Name: Busan
Address: KR

Busan is warmest in August, with average highs of 28 °C, and coldest in January, when nights average -0.06 °C. July is the wettest month (247 mm) and December the driest (28 mm). Figures are 1991–2020 climate normals.

Across a full year Busan averages 1,329 mm of rain, 62 days above 25 °C and 39 days below freezing.

South Korea · population 3,285,147 · 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 -0.06 °C
Driest month December 28 mm
Wettest month July 247 mm
Least cloud December 36 % cloud
Hottest on record August 34 °C
Coldest on record January -12 °C
Warmest sea August 26 °C

What to expectBusan through the year

Busan has a clear annual cycle: average daily highs run from 6.4 °C in January to 28 °C in August, a swing of 22 °C in mean temperature across the year.

Counted across a normal year, 62 days a year reach 25 °C, 4 of them reach 30 °C, 39 nights drop below freezing. The warmest reading in the 1991–2020 record is 34 °C, in August.

Rain is strongly seasonal. July averages 247 mm against 28 mm in December — 8.7 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Busan 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	6.4 °C	32 mm	41 %
February	8.2 °C	43 mm	47 %
March	11.8 °C	80 mm	53 %
April	16.0 °C	113 mm	55 %
May	19.9 °C	118 mm	59 %
June	22.9 °C	171 mm	71 %
July	26.0 °C	247 mm	73 %
August	27.6 °C	217 mm	64 %
September	24.4 °C	163 mm	60 %
October	20.1 °C	69 mm	44 %
November	14.3 °C	48 mm	40 %
December	8.4 °C	28 mm	36 %

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	6.4 °C	-0.1 °C	3.1 °C	16.8 °C	-11.9 °C	0	0	16
February	8.2 °C	1.4 °C	4.8 °C	16.4 °C	-9.7 °C	0	0	10
March	11.8 °C	5.1 °C	8.4 °C	19.9 °C	-4.1 °C	0	0	2
April	16.0 °C	9.7 °C	12.8 °C	22.7 °C	0.5 °C	0	0	0
May	19.9 °C	14.0 °C	16.9 °C	28.0 °C	7.2 °C	0	0	0
June	22.9 °C	18.1 °C	20.4 °C	28.9 °C	12.5 °C	3	0	0
July	26.0 °C	22.4 °C	24.0 °C	33.4 °C	16.2 °C	20	1	0
August	27.6 °C	23.7 °C	25.5 °C	34.4 °C	17.8 °C	27	3	0
September	24.4 °C	19.9 °C	22.0 °C	30.8 °C	12.5 °C	12	0	0
October	20.1 °C	14.2 °C	17.1 °C	27.5 °C	3.1 °C	0	0	0
November	14.3 °C	7.9 °C	11.1 °C	22.8 °C	-3.2 °C	0	0	0
December	8.4 °C	1.9 °C	5.1 °C	18.5 °C	-8.9 °C	0	0	10

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	32 mm	4	10 h/day	41 %	55 %	19 km/h	14.8 °C
February	43 mm	5	11 h/day	47 %	56 %	19 km/h	13.7 °C
March	80 mm	7	12 h/day	53 %	62 %	20 km/h	13.7 °C
April	113 mm	8	13 h/day	55 %	70 %	20 km/h	14.7 °C
May	118 mm	8	14 h/day	59 %	77 %	18 km/h	16.6 °C
June	171 mm	9	15 h/day	71 %	84 %	18 km/h	20.0 °C
July	247 mm	14	14 h/day	73 %	89 %	19 km/h	23.2 °C
August	217 mm	13	13 h/day	64 %	85 %	18 km/h	26.1 °C
September	163 mm	10	12 h/day	60 %	77 %	18 km/h	24.6 °C
October	69 mm	5	11 h/day	44 %	68 %	17 km/h	21.9 °C
November	48 mm	4	10 h/day	40 %	63 %	18 km/h	19.3 °C
December	28 mm	3	9.8 h/day	36 %	58 %	19 km/h	16.9 °C

How Busan 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
Busan	28 °C	-0.06 °C	1,329 mm	62
Changwon · South Korea	29 °C	-1.5 °C	1,323 mm	92
Geoje · South Korea	27 °C	1.6 °C	1,349 mm	52
Ulsan · South Korea	28 °C	-1.4 °C	1,246 mm	81
Gyeongju · South Korea	29 °C	-2.8 °C	1,135 mm	104
Gyeongsan-si · South Korea	30 °C	-3.3 °C	1,055 mm	114
Chinju · South Korea	29 °C	-3.7 °C	1,432 mm	105

Where Busan ranks

Ranking	Position	Value
The coolest places in Asia in June	50thof 50	23 °C

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

QuestionsCommon questions about Busan’s climate

When is the best time to visit Busan?

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 Busan get?

In August, the warmest month, daily highs average 28 °C. About 4 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 -0.06 °C in January, the coldest month. A normal year has 39 nights below freezing.

Which month is wettest in Busan?

July, averaging 247 mm over 14 days with rain. The driest month is December with 28 mm. The year as a whole averages 1,329 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 Busan 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.