Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 21.4 °C | 20.1 °C | 11 days | Pleasant — a good time to go |
| February | 23.1 °C | 19.4 °C | 9 days | Pleasant — a good time to go |
| March | 27.2 °C | 20.8 °C | 10 days | Ideal — one of the best times of year |
| April | 30 °C | 23.5 °C | 14 days | Possible, with trade-offs |
| May | 31.8 °C | 26.7 °C | 19 days | Unfavourable season |
| June | 32.8 °C | 28.5 °C | 20 days | Unfavourable season |
| July | 32.3 °C | 29.3 °C | 20 days | Unfavourable season |
| August | 31.5 °C | 29.1 °C | 23 days | Unfavourable season |
| September | 30.3 °C | 28.9 °C | 21 days | Unfavourable season |
| October | 27.8 °C | 27.7 °C | 19 days | Unfavourable season |
| November | 25.8 °C | 25.6 °C | 12 days | Ideal — one of the best times of year |
| December | 21.8 °C | 22.5 °C | 8 days | Pleasant — a good time to go |
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
No specific restrictions
Usual precautions apply.
Official advice updated 27 August 2026
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 Haikou in June?
The sea averages 28.5°C in June — yes, pleasant swimming.
How hot is Haikou in June?
Expect 32.8°C in the afternoon and 26.6°C at night, averaged over the last 10 years.
Does it rain a lot in Haikou in June?
Around 20 days with rain (≥ 1 mm) in the month — 66% of days.