May in Chiang Mai averages a daily high of 35.2°C. Expect roughly 16 wet days totalling 172.2mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Chiang Mai is December–January.
Based on CHIANG MAI, TH (0.8km), 1995–2024. 15 years of May data.