In September, Jacksonville typically sees daytime highs of 30.3°C and overnight lows around 21.5°C. Compared to the annual average high of 25.8°C, September runs +4.5°C.
September in Jacksonville averages a daytime high of 30.3°C and an overnight low of 21.5°C.
September runs +4.5°C compared to Jacksonville's annual average high of 25.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 30.3°C and cooler evenings around 21.5°C.