July in Kōshi averages a daily high of 31.9°C. Expect roughly 13.7 wet days totalling 378.5mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Kōshi is April–May.
Based on KUMAMOTO, JA (11.1km), 1995–2024. 27 years of July data.