April in Casper averages a daily high of 13.6°C with nights around -0.6°C. Expect roughly 7.4 wet days totalling 38.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Casper is June.
Based on CASPER WASTE WATER TREATMENT PLANT, WY US (1.8km), 1995–2024. 23 years of April data.