August in Oshkosh averages a daily high of 26.7°C with nights around 16.5°C. Expect roughly 10 wet days totalling 99.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Oshkosh is May–September.
Based on OSHKOSH, WI US (1.3km), 1995–2024. 30 years of August data.