October in Iwamizawa averages a daily high of 15.7°C. Expect roughly 14.5 wet days totalling 113.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Iwamizawa is June–September.
Based on IWAMIZAWA, JA (2.6km), 1995–2024. 28 years of October data.