September in La Crosse averages a daily high of 21.8°C with nights around 11.8°C. Expect roughly 9.8 wet days totalling 97.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit La Crosse is June–September.
Based on LA CROSSE WEATHER FORECAST OFFICE, WI US (4.5km), 1995–2024. 25 years of September data.