September in Niitsu-honchō averages a daily high of 26.6°C. Expect roughly 12.8 wet days totalling 154.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Niitsu-honchō is May–June.
Based on NIIGATA, JA (14.5km), 1995–2024. 20 years of September data.