In September, Naples typically sees daytime highs of 26.5°C and overnight lows around 17.2°C. Compared to the annual average high of 20.7°C, September runs +5.8°C.
September in Naples averages a daytime high of 26.5°C and an overnight low of 17.2°C.
September runs +5.8°C compared to Naples's annual average high of 20.7°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.5°C and cooler evenings around 17.2°C.