In September, Otaru typically sees daytime highs of 20.0°C and overnight lows around 11.9°C. Compared to the annual average high of 10.2°C, September runs +9.8°C.
September in Otaru averages a daytime high of 20.0°C and an overnight low of 11.9°C.
September runs +9.8°C compared to Otaru's annual average high of 10.2°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 20.0°C and cooler evenings around 11.9°C.