August in Idaho Falls averages a daily high of 30°C with nights around 11.8°C. Expect roughly 4.9 wet days totalling 17mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Idaho Falls is June.
Based on IDAHO FALLS KIFI, ID US (5.5km), 1995–2024. 25 years of August data.