September in Haikou averages a daily high of 23.9°C with nights around 15.6°C. Expect roughly 11.8 wet days totalling 117.2mm. 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. 24 years of September data.