September in Eau Claire averages a daily high of 23.3°C with nights around 12.3°C. Expect roughly 10.1 wet days totalling 89.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Eau Claire is May–September.
Based on EAU CLAIRE 3 SW, WI US (3km), 1995–2024. 14 years of September data.