August in Mississauga averages a daily high of 26.8°C with nights around 12.8°C. Expect roughly 9.5 wet days totalling 71.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Mississauga is May–September.
Based on GEORGETOWN WWTP, ON CA (19.1km), 1995–2024. 19 years of August data.