July in Halton Hills averages a daily high of 27.3°C with nights around 13.5°C. Expect roughly 9.5 wet days totalling 64.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Halton Hills is May–September.
Based on GEORGETOWN WWTP, ON CA (4km), 1995–2024. 19 years of July data.