March in Rayong averages a daily high of 33.4°C with nights around 24.9°C. Expect roughly 4 wet days totalling 42.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Rayong is December–March.
Based on SATTAHIP, TH (29.8km), 1995–2024. 20 years of March data.