April in Green Bay averages a daily high of 12°C with nights around 0.6°C. Expect roughly 9.5 wet days totalling 82.9mm. Demanding conditions — pack for it and plan indoor options.
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 April data.