May in Si Racha averages a daily high of 34.3°C. Expect roughly 14.3 wet days totalling 146.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Si Racha is November–February.
Based on CHON BURI, TH (22.3km), 1995–2024. 13 years of May data.