August in Knoxville averages a daily high of 31.2°C with nights around 19°C. Expect roughly 8.8 wet days totalling 89.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Knoxville is April–May.
Based on KNOXVILLE EXPERIMENTAL STATION, TN US (7.7km), 1995–2024. 29 years of August data.