In September, Haeju typically sees daytime highs of 24.4°C and overnight lows around 14.3°C. Compared to the annual average high of 15.2°C, September runs +9.2°C.
September in Haeju averages a daytime high of 24.4°C and an overnight low of 14.3°C.
September runs +9.2°C compared to Haeju's annual average high of 15.2°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 24.4°C and cooler evenings around 14.3°C.