Monthly Climate
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Best time to visit Ulsan

October is the best time to visit Ulsan for general sightseeing, with average highs of 20 °C and about 5 wet days. The comfortable season runs roughly May to June. 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 94/100
A beach holiday September sea 25 °C
The least cloud December 35 % average cloud cover
The least rain December 28 mm
Warmth August 28 °C
Cooler weather January 5.9 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 94 20 °C 5 71
2 May 91 22 °C 8 51
3 June 84 25 °C 9 70
4 September 81 25 °C 11 79
5 April 79 17 °C 8 29
6 November 72 14 °C 5 43
7 July 64 27 °C 13 76
8 March 60 12 °C 7 16
9 August 60 28 °C 14 77
10 February 47 8.1 °C 5 21
11 December 46 7.9 °C 3 35
12 January 38 5.9 °C 4 25

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 June to October.

Month Sea Air Sunshine Beach score
January 15 °C 5.9 °C 40 % 25
February 14 °C 8.1 °C 47 % 21
March 14 °C 12 °C 53 % 16
April 15 °C 17 °C 55 % 29
May 17 °C 22 °C 59 % 51
June 20 °C 25 °C 71 % 70
July 23 °C 27 °C 73 % 76
August 26 °C 28 °C 66 % 77
September 25 °C 25 °C 63 % 79
October 22 °C 20 °C 47 % 71
November 20 °C 14 °C 40 % 43
December 17 °C 7.9 °C 35 % 35

When to think twice

January scores lowest with about 4 wet days and highs near 5.9 °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 5.9 °C 33 mm 40 %
February 8.1 °C 39 mm 47 %
March 12.3 °C 71 mm 53 %
April 17.3 °C 92 mm 55 %
May 21.7 °C 100 mm 59 %
June 24.6 °C 152 mm 71 %
July 27.4 °C 222 mm 73 %
August 28.4 °C 215 mm 66 %
September 24.5 °C 174 mm 63 %
October 20.1 °C 75 mm 47 %
November 14.2 °C 46 mm 40 %
December 7.9 °C 28 mm 35 %

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.