In September, Muroran typically sees daytime highs of 21.1°C and overnight lows around 13.2°C. Compared to the annual average high of 11.4°C, September runs +9.7°C.
September in Muroran averages a daytime high of 21.1°C and an overnight low of 13.2°C.
September runs +9.7°C compared to Muroran's annual average high of 11.4°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 21.1°C and cooler evenings around 13.2°C.