In September, Sayama typically sees daytime highs of 26.4°C and overnight lows around 18.7°C. Compared to the annual average high of 19.4°C, September runs +7.0°C.
September in Sayama averages a daytime high of 26.4°C and an overnight low of 18.7°C.
September runs +7.0°C compared to Sayama's annual average high of 19.4°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.4°C and cooler evenings around 18.7°C.