In September, Kusatsu typically sees daytime highs of 26.0°C and overnight lows around 17.8°C. Compared to the annual average high of 18.0°C, September runs +8.0°C.
September in Kusatsu averages a daytime high of 26.0°C and an overnight low of 17.8°C.
September runs +8.0°C compared to Kusatsu's annual average high of 18.0°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 26.0°C and cooler evenings around 17.8°C.