October in Janesville averages a daily high of 16.8°C with nights around 4.4°C. Expect roughly 10.3 wet days totalling 80.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Janesville is May–September.
Based on AFTON JANESVILLE WWTP, WI US (6.3km), 1995–2024. 30 years of October data.