April in Idaho Falls averages a daily high of 14.5°C with nights around 0.6°C. Expect roughly 9.5 wet days totalling 33.7mm. Generally workable, with some weather to plan around.
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 April data.