August in Madison averages a daily high of 27.2°C with nights around 14.9°C. Expect roughly 10 wet days totalling 104.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Madison is June–September.
Based on UW ARBORETUM MADISON, WI US (4.2km), 1995–2024. 29 years of August data.