Monthly Climate
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Best time to visit Wŏnsan

May is the best time to visit Wŏnsan for general sightseeing, with average highs of 20 °C and about 9 wet days. The comfortable season runs roughly May to June. The sea stays above 20 °C from July to September.

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 May comfort 89/100
A beach holiday August sea 24 °C
The least cloud December 39 % average cloud cover
The least rain January 33 mm
Warmth August 27 °C
Cooler weather January 0.5 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 May 89 20 °C 9 34
2 September 86 23 °C 11 68
3 June 83 24 °C 12 55
4 October 82 17 °C 7 43
5 April 71 15 °C 8 19
6 July 66 26 °C 17 70
7 August 64 27 °C 17 74
8 November 50 9.6 °C 8 14
9 March 45 8.4 °C 7 17
10 January 38 0.5 °C 5 21
11 February 38 3.1 °C 5 21
12 December 38 2.7 °C 5 21

For a beach holiday

August scores highest, with a sea temperature of 24 °C and air temperatures around 27 °C. The sea is above 20 °C from July to September.

Month Sea Air Sunshine Beach score
January 5.1 °C 0.5 °C 40 % 21
February 4.0 °C 3.1 °C 42 % 21
March 4.9 °C 8.4 °C 48 % 17
April 8.3 °C 15 °C 51 % 19
May 13 °C 20 °C 57 % 34
June 18 °C 24 °C 68 % 55
July 22 °C 26 °C 76 % 70
August 24 °C 27 °C 73 % 74
September 22 °C 23 °C 61 % 68
October 18 °C 17 °C 46 % 43
November 13 °C 9.6 °C 45 % 14
December 8.6 °C 2.7 °C 39 % 21

When to think twice

December scores lowest with about 5 wet days and highs near 2.7 °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 0.5 °C 33 mm 40 %
February 3.1 °C 36 mm 42 %
March 8.4 °C 45 mm 48 %
April 15.1 °C 67 mm 51 %
May 20.4 °C 103 mm 57 %
June 24.0 °C 128 mm 68 %
July 26.4 °C 276 mm 76 %
August 26.7 °C 263 mm 73 %
September 22.8 °C 148 mm 61 %
October 17.4 °C 68 mm 46 %
November 9.6 °C 70 mm 45 %
December 2.7 °C 38 mm 39 %

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.