In September, Iwaki typically sees daytime highs of 22.6°C and overnight lows around 17.3°C. Compared to the annual average high of 15.3°C, September runs +7.3°C.
September in Iwaki averages a daytime high of 22.6°C and an overnight low of 17.3°C.
September runs +7.3°C compared to Iwaki's annual average high of 15.3°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 22.6°C and cooler evenings around 17.3°C.