September in Clarksville averages a daily high of 28.8°C with nights around 15.9°C. Expect roughly 8.6 wet days totalling 90mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Clarksville is April–May.
Based on CLARKSVILLE WWTP, TN US (1.9km), 1995–2024. 28 years of September data.