In September, Ishikari typically sees daytime highs of 21.8°C and overnight lows around 12.5°C. Compared to the annual average high of 12.0°C, September runs +9.7°C.
September in Ishikari averages a daytime high of 21.8°C and an overnight low of 12.5°C.
September runs +9.7°C compared to Ishikari's annual average high of 12.0°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 21.8°C and cooler evenings around 12.5°C.