August in Green Bay averages a daily high of 25.8°C with nights around 14.4°C. Expect roughly 8.5 wet days totalling 98.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Green Bay is May–September.
Based on GREEN BAY BOTANICAL, WI US (6.4km), 1995–2024. 22 years of August data.