May in Kollam averages a daily high of 33°C with nights around 25°C. Expect roughly 18 wet days totalling 374.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Kollam is December–February.
Based on THIRUVANANTHAPURAM, IN (59.8km), 1995–2024. 26 years of May data.