Monthly Climate
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Best time to visit Busan

October is the best time to visit Busan for general sightseeing, with average highs of 20 °C and about 5 wet days. The sea stays above 20 °C from June to October.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking October comfort 95/100
A beach holiday September sea 25 °C
The least cloud December 36 % average cloud cover
The least rain December 28 mm
Warmth August 28 °C
Cooler weather January 6.4 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 95 20 °C 5 71
2 May 88 20 °C 8 45
3 June 85 23 °C 9 64
4 September 82 24 °C 10 81
5 April 76 16 °C 8 24
6 November 75 14 °C 4 43
7 July 66 26 °C 14 74
8 August 62 28 °C 13 79
9 March 60 12 °C 7 16
10 December 50 8.4 °C 3 35
11 February 49 8.2 °C 5 22
12 January 41 6.4 °C 4 26

For a beach holiday

September scores highest, with a sea temperature of 25 °C and air temperatures around 24 °C. The sea is above 20 °C from June to October.

Month Sea Air Sunshine Beach score
January 15 °C 6.4 °C 41 % 26
February 14 °C 8.2 °C 47 % 22
March 14 °C 12 °C 53 % 16
April 15 °C 16 °C 55 % 24
May 17 °C 20 °C 59 % 45
June 20 °C 23 °C 71 % 64
July 23 °C 26 °C 73 % 74
August 26 °C 28 °C 64 % 79
September 25 °C 24 °C 60 % 81
October 22 °C 20 °C 44 % 71
November 19 °C 14 °C 40 % 43
December 17 °C 8.4 °C 36 % 35

When to think twice

January scores lowest with about 4 wet days and highs near 6.4 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. 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.