Monthly Climate
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Best time to visit Haeju

September is the best time to visit Haeju for general sightseeing, with average highs of 24 °C and about 7 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 91/100
A beach holiday September sea 23 °C
The least cloud October 44 % average cloud cover
The least rain January 15 mm
Warmth August 27 °C
Cooler weather January 0.6 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 September 91 24 °C 7 83
2 May 88 19 °C 7 35
3 June 88 24 °C 8 61
4 October 86 18 °C 5 50
5 April 68 14 °C 6 18
6 July 67 26 °C 15 68
7 August 65 27 °C 14 77
8 November 51 9.8 °C 7 18
9 March 44 8.0 °C 5 21
10 January 37 0.6 °C 3 24
11 February 37 3.0 °C 3 24
12 December 36 2.8 °C 4 23

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 3.7 °C 0.6 °C 50 % 24
February 2.4 °C 3.0 °C 46 % 24
March 4.6 °C 8.0 °C 47 % 21
April 8.8 °C 14 °C 49 % 18
May 13 °C 19 °C 54 % 35
June 18 °C 24 °C 63 % 61
July 22 °C 26 °C 73 % 68
August 25 °C 27 °C 64 % 77
September 23 °C 24 °C 54 % 83
October 18 °C 18 °C 44 % 50
November 13 °C 9.8 °C 48 % 18
December 7.6 °C 2.8 °C 50 % 23

When to think twice

December scores lowest with about 4 wet days and highs near 2.8 °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 0.6 °C 15 mm 50 %
February 3.0 °C 21 mm 46 %
March 8.0 °C 29 mm 47 %
April 14.1 °C 56 mm 49 %
May 19.4 °C 92 mm 54 %
June 23.8 °C 115 mm 63 %
July 26.2 °C 277 mm 73 %
August 27.4 °C 255 mm 64 %
September 23.8 °C 96 mm 54 %
October 17.7 °C 42 mm 44 %
November 9.8 °C 45 mm 48 %
December 2.8 °C 21 mm 50 %

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.