August in Ōmuta averages a daily high of 33.1°C. Expect roughly 12.2 wet days totalling 299.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Ōmuta is April–May.
Based on SAGA, JA (29.5km), 1995–2024. 24 years of August data.