May in Guanyin averages a daily high of 27.7°C with nights around 19.1°C. Expect roughly 13.1 wet days totalling 99.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Guanyin is March–May.
Based on YIBIN, CH (38.8km), 1995–2024. 24 years of May data.