Monthly Climate
Menu

Best time to visit Hwaseong-si

September is the best time to visit Hwaseong-si for general sightseeing, with average highs of 24 °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 September comfort 88/100
A beach holiday September sea 23 °C
The least cloud October 44 % average cloud cover
The least rain January 22 mm
Warmth August 27 °C
Cooler weather January 1.6 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 September 88 24 °C 8 82
2 June 88 24 °C 8 57
3 October 87 18 °C 6 56
4 May 87 19 °C 7 34
5 April 66 14 °C 7 17
6 July 65 26 °C 15 65
7 August 63 27 °C 14 76
8 November 54 11 °C 7 20
9 March 44 8.4 °C 6 20
10 January 35 1.6 °C 4 23
11 February 35 3.7 °C 4 22
12 December 34 3.9 °C 6 19

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 5.6 °C 1.6 °C 55 % 23
February 4.0 °C 3.7 °C 49 % 22
March 4.8 °C 8.4 °C 48 % 20
April 7.8 °C 14 °C 50 % 17
May 12 °C 19 °C 54 % 34
June 16 °C 24 °C 64 % 57
July 21 °C 26 °C 71 % 65
August 23 °C 27 °C 62 % 76
September 23 °C 24 °C 54 % 82
October 20 °C 18 °C 44 % 56
November 15 °C 11 °C 49 % 20
December 9.7 °C 3.9 °C 51 % 19

When to think twice

December scores lowest with about 6 wet days and highs near 3.9 °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 1.6 °C 22 mm 55 %
February 3.7 °C 30 mm 49 %
March 8.4 °C 41 mm 48 %
April 14.2 °C 78 mm 50 %
May 19.4 °C 105 mm 54 %
June 23.6 °C 134 mm 64 %
July 26.4 °C 301 mm 71 %
August 27.5 °C 244 mm 62 %
September 23.9 °C 127 mm 54 %
October 18.2 °C 60 mm 44 %
November 10.8 °C 55 mm 49 %
December 3.9 °C 28 mm 51 %

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.