May in Haikou averages a daily high of 25.2°C with nights around 15°C. Expect roughly 10.7 wet days totalling 84.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Haikou is February–April.
Based on KUNMING, CH (28.5km), 1995–2024. 23 years of May data.