Monthly Climate
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Best time to visit Bucheon-si

May is the best time to visit Bucheon-si for general sightseeing, with average highs of 21 °C and about 8 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 September sea 23 °C
The least cloud October 44 % average cloud cover
The least rain January 18 mm
Warmth August 28 °C
Cooler weather January 1.5 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 May 89 21 °C 8 38
2 September 89 24 °C 8 83
3 October 88 18 °C 5 57
4 June 86 25 °C 8 61
5 April 71 15 °C 7 22
6 July 64 27 °C 15 65
7 August 62 28 °C 14 76
8 November 53 11 °C 7 20
9 March 48 9.2 °C 5 21
10 January 38 1.5 °C 4 24
11 February 37 4.1 °C 4 23
12 December 37 3.5 °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 5.5 °C 1.5 °C 47 % 24
February 4.0 °C 4.1 °C 46 % 23
March 4.9 °C 9.2 °C 48 % 21
April 7.9 °C 15 °C 51 % 22
May 12 °C 21 °C 55 % 38
June 17 °C 25 °C 65 % 61
July 21 °C 27 °C 73 % 65
August 24 °C 28 °C 64 % 76
September 23 °C 24 °C 55 % 83
October 20 °C 18 °C 44 % 57
November 15 °C 11 °C 46 % 20
December 9.5 °C 3.5 °C 45 % 21

When to think twice

December scores lowest with about 5 wet days and highs near 3.5 °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 1.5 °C 18 mm 47 %
February 4.1 °C 25 mm 46 %
March 9.2 °C 35 mm 48 %
April 15.4 °C 65 mm 51 %
May 20.7 °C 92 mm 55 %
June 24.9 °C 129 mm 65 %
July 27.1 °C 300 mm 73 %
August 28.1 °C 247 mm 64 %
September 24.4 °C 119 mm 55 %
October 18.4 °C 53 mm 44 %
November 10.7 °C 47 mm 46 %
December 3.5 °C 23 mm 45 %

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.