Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 1.1 °C | 3.2 °C | 4 days | Unfavourable season |
| February | 3.8 °C | 2.3 °C | 4 days | Unfavourable season |
| March | 9.6 °C | 5.1 °C | 4 days | Unfavourable season |
| April | 15.7 °C | 9.9 °C | 6 days | Possible, with trade-offs |
| May | 20.4 °C | 14.7 °C | 8 days | Pleasant — a good time to go |
| June | 24.8 °C | 18.9 °C | 10 days | Ideal — one of the best times of year |
| July | 27.4 °C | 22.5 °C | 18 days | Possible, with trade-offs |
| August | 28.1 °C | 25.8 °C | 16 days | Possible, with trade-offs |
| September | 24.6 °C | 23.8 °C | 9 days | Ideal — one of the best times of year |
| October | 17.8 °C | 18.5 °C | 6 days | Possible, with trade-offs |
| November | 10.1 °C | 13.1 °C | 6 days | Unfavourable season |
| December | 2.6 °C | 7 °C | 4 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Entry rules depend on your nationality and change often. Check them before booking.
Safety
Travel advised against
Authorities advise against travelling there.
Official advice updated 10 December 2025
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Haeju in August?
The sea averages 25.8°C in August — yes, pleasant swimming.
How hot is Haeju in August?
Expect 28.1°C in the afternoon and 22°C at night, averaged over the last 10 years.
Does it rain a lot in Haeju in August?
Around 16 days with rain (≥ 1 mm) in the month — 51% of days.