Monthly Climate
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Best time to visit Jeju City

October is the best time to visit Jeju City for general sightseeing, with average highs of 21 °C and about 7 wet days. The sea stays above 20 °C from July 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 88/100
A beach holiday September sea 25 °C
The least cloud October 50 % average cloud cover
The least rain February 66 mm
Warmth August 29 °C
Cooler weather January 7.8 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 88 21 °C 7 68
2 May 86 20 °C 9 43
3 June 78 24 °C 12 61
4 April 75 16 °C 9 22
5 November 73 16 °C 9 37
6 September 71 25 °C 12 79
7 July 58 28 °C 13 77
8 March 56 12 °C 10 11
9 August 53 29 °C 14 75
10 December 47 10 °C 11 19
11 February 43 8.8 °C 10 12
12 January 37 7.8 °C 11 13

For a beach holiday

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

Month Sea Air Sunshine Beach score
January 15 °C 7.8 °C 78 % 13
February 14 °C 8.8 °C 71 % 12
March 14 °C 12 °C 63 % 11
April 14 °C 16 °C 61 % 22
May 16 °C 20 °C 63 % 43
June 20 °C 24 °C 73 % 61
July 24 °C 28 °C 69 % 77
August 27 °C 29 °C 61 % 75
September 25 °C 25 °C 58 % 79
October 22 °C 21 °C 50 % 68
November 19 °C 16 °C 58 % 37
December 17 °C 10 °C 69 % 19

When to think twice

January scores lowest with about 11 wet days and highs near 7.8 °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 7.8 °C 77 mm 78 %
February 8.8 °C 66 mm 71 %
March 12.0 °C 97 mm 63 %
April 16.3 °C 106 mm 61 %
May 20.3 °C 110 mm 63 %
June 23.6 °C 199 mm 73 %
July 27.7 °C 194 mm 69 %
August 28.8 °C 185 mm 61 %
September 25.3 °C 186 mm 58 %
October 20.6 °C 92 mm 50 %
November 15.5 °C 71 mm 58 %
December 10.2 °C 73 mm 69 %

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.