September in Johnson City averages a daily high of 27°C with nights around 13.8°C. Expect roughly 9.2 wet days totalling 84.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Johnson City is April–May.
Based on ELIZABETHTON, TN US (10.4km), 1995–2024. 30 years of September data.