August in Dayton averages a daily high of 30.4°C with nights around 18.8°C. Expect roughly 8.1 wet days totalling 79.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Dayton is September–October.
Based on DAYTON MCD, OH US (2.5km), 1995–2024. 26 years of August data.