October in Green Bay averages a daily high of 15.3°C with nights around 4.3°C. Expect roughly 8.6 wet days totalling 78.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Green Bay is May–September.
Based on GREEN BAY BOTANICAL, WI US (6.4km), 1995–2024. 20 years of October data.