August in West Allis averages a daily high of 28.2°C with nights around 16.7°C. Expect roughly 9.9 wet days totalling 105.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit West Allis is August–September.
Based on WEST ALLIS, WI US (2.5km), 1995–2024. 14 years of August data.