May in Humen averages a daily high of 30.1°C with nights around 22.9°C. Expect roughly 16.3 wet days totalling 348.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Humen is November–December.
Based on GUANGZHOU, CH (48.3km), 1995–2024. 18 years of May data.