August in Ōmihachiman averages a daily high of 32.3°C. Expect roughly 9.5 wet days totalling 131.1mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ōmihachiman is May–June.
Based on HIKONE, JA (22.1km), 1995–2024. 24 years of August data.