August in Negombo averages a daily high of 30.5°C with nights around 26°C. Expect roughly 12.7 wet days totalling 111.7mm. 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. 13 years of August data.