July in Casper averages a daily high of 31.8°C with nights around 14.3°C. Expect roughly 6 wet days totalling 30.7mm. 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 July data.