In September, Suwa typically sees daytime highs of 21.4°C and overnight lows around 14.0°C. Compared to the annual average high of 13.6°C, September runs +7.8°C.
September in Suwa averages a daytime high of 21.4°C and an overnight low of 14.0°C.
September runs +7.8°C compared to Suwa's annual average high of 13.6°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 21.4°C and cooler evenings around 14.0°C.