September in Saint Paul averages a daily high of 23.4°C with nights around 12.3°C. Expect roughly 9.2 wet days totalling 71.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Saint Paul is May–June.
Based on ST. PAUL DOWNTOWN AIRPORT, MN US (3.2km), 1995–2024. 29 years of September data.