May in Pu'er averages a daily high of 28.6°C with nights around 18°C. Expect roughly 14.5 wet days totalling 156.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Pu'er is November–March.
Based on SIMAO, CH (2.5km), 1995–2024. 24 years of May data.