October in Ishikari averages a daily high of 16.4°C. Expect roughly 13.3 wet days totalling 110.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ishikari is May–September.
Based on SAPPORO, JA (19.3km), 1995–2024. 22 years of October data.