May in Trincomalee averages a daily high of 34.7°C with nights around 25.9°C. Expect roughly 5.4 wet days totalling 90.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Trincomalee is January–March.
Based on CHINA BAY, CE (6.7km), 1995–2024. 14 years of May data.