March in Negombo averages a daily high of 31.9°C with nights around 25.3°C. Expect roughly 10.2 wet days totalling 109.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Negombo is January–February.
Based on COLOMBO, CE (34.5km), 1995–2024. 12 years of March data.