September in Madison averages a daily high of 23.7°C with nights around 10.2°C. Expect roughly 8.6 wet days totalling 92.6mm. 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 September data.