July in Dayton averages a daily high of 30.6°C with nights around 19.8°C. Expect roughly 10.3 wet days totalling 109.7mm. 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. 24 years of July data.