In September, Iwakuni typically sees daytime highs of 26.3°C and overnight lows around 19.3°C. Compared to the annual average high of 18.6°C, September runs +7.7°C.
September in Iwakuni averages a daytime high of 26.3°C and an overnight low of 19.3°C.
September runs +7.7°C compared to Iwakuni's annual average high of 18.6°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.3°C and cooler evenings around 19.3°C.