In September, Kumagaya typically sees daytime highs of 26.3°C and overnight lows around 18.8°C. Compared to the annual average high of 19.5°C, September runs +6.9°C.
September in Kumagaya averages a daytime high of 26.3°C and an overnight low of 18.8°C.
September runs +6.9°C compared to Kumagaya's annual average high of 19.5°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.3°C and cooler evenings around 18.8°C.