Monthly Climate
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Best time to visit Gunsan

October is the best time to visit Gunsan for general sightseeing, with average highs of 19 °C and about 5 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 October comfort 91/100
A beach holiday September sea 23 °C
The least cloud October 46 % average cloud cover
The least rain January 24 mm
Warmth August 28 °C
Cooler weather January 3.3 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 91 19 °C 5 57
2 May 89 20 °C 7 37
3 September 87 24 °C 8 83
4 June 86 24 °C 8 66
5 April 70 15 °C 7 20
6 July 64 27 °C 14 73
7 November 62 12 °C 6 21
8 August 61 28 °C 14 76
9 March 48 9.3 °C 6 18
10 December 37 5.7 °C 6 19
11 February 37 5.0 °C 5 22
12 January 36 3.3 °C 5 21

For a beach holiday

September scores highest, with a sea temperature of 23 °C and air temperatures around 24 °C. The sea is above 20 °C from July to September.

Month Sea Air Sunshine Beach score
January 7.0 °C 3.3 °C 65 % 21
February 5.5 °C 5.0 °C 58 % 22
March 6.3 °C 9.3 °C 53 % 18
April 9.4 °C 15 °C 53 % 20
May 14 °C 20 °C 57 % 37
June 19 °C 24 °C 67 % 66
July 23 °C 27 °C 72 % 73
August 26 °C 28 °C 63 % 76
September 23 °C 24 °C 55 % 83
October 19 °C 19 °C 46 % 57
November 15 °C 12 °C 51 % 21
December 10 °C 5.7 °C 60 % 19

When to think twice

January scores lowest with about 5 wet days and highs near 3.3 °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 3.3 °C 24 mm 65 %
February 5.0 °C 31 mm 58 %
March 9.3 °C 47 mm 53 %
April 14.9 °C 82 mm 53 %
May 19.9 °C 87 mm 57 %
June 23.9 °C 132 mm 67 %
July 26.8 °C 256 mm 72 %
August 28.0 °C 225 mm 63 %
September 24.4 °C 146 mm 55 %
October 18.9 °C 57 mm 46 %
November 12.1 °C 44 mm 51 %
December 5.7 °C 28 mm 60 %

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.