September in Milwaukee averages a daily high of 22.9°C with nights around 13.6°C. Expect roughly 8.1 wet days totalling 80.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Milwaukee is June–September.
Based on MILWAUKEE MITCHELL AIRPORT, WI US (9.3km), 1995–2024. 30 years of September data.