September in Choshi averages a daily high of 26.1°C with nights around 21.3°C. Expect roughly 11.2 wet days totalling 209.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Choshi is May–October.
Based on CHOSHI, JA (1.5km), 1995–2024. 21 years of September data.