July in Kolonnawa averages a daily high of 30.6°C with nights around 25.9°C. Expect roughly 11.4 wet days totalling 102mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kolonnawa is January–February.
Based on COLOMBO, CE (4.2km), 1995–2024. 15 years of July data.