June in Great Falls averages a daily high of 24.6°C with nights around 9.8°C. Expect roughly 9.2 wet days totalling 59.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Great Falls is August–September.
Based on GREAT FALLS 16ST, MT US (2.1km), 1995–2024. 14 years of June data.