In September, Seosan typically sees daytime highs of 24.4°C and overnight lows around 16.9°C. Compared to the annual average high of 15.5°C, September runs +8.8°C.
September in Seosan averages a daytime high of 24.4°C and an overnight low of 16.9°C.
September runs +8.8°C compared to Seosan's annual average high of 15.5°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 24.4°C and cooler evenings around 16.9°C.