In September, Johnson City typically sees daytime highs of 26.6°C and overnight lows around 13.2°C. Compared to the annual average high of 19.7°C, September runs +7.0°C.
September in Johnson City averages a daytime high of 26.6°C and an overnight low of 13.2°C.
September runs +7.0°C compared to Johnson City's annual average high of 19.7°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.6°C and cooler evenings around 13.2°C.