August in Casper averages a daily high of 30°C with nights around 12.9°C. Expect roughly 5.9 wet days totalling 26.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Casper is June.
Based on CASPER WASTE WATER TREATMENT PLANT, WY US (1.8km), 1995–2024. 22 years of August data.