In September, Koson typically sees daytime highs of 30.1°C and overnight lows around 12.9°C. Compared to the annual average high of 22.3°C, September runs +7.7°C.
September in Koson averages a daytime high of 30.1°C and an overnight low of 12.9°C.
September runs +7.7°C compared to Koson's annual average high of 22.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 30.1°C and cooler evenings around 12.9°C.