August in Haikou averages a daily high of 25.4°C with nights around 17.3°C. Expect roughly 17.3 wet days totalling 211.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Haikou is February–April.
Based on KUNMING, CH (28.5km), 1995–2024. 23 years of August data.