January in West Allis averages a daily high of -0.5°C with nights around -9.1°C. Expect roughly 10.7 wet days totalling 53.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit West Allis is August–September.
Based on WEST ALLIS, WI US (2.5km), 1995–2024. 12 years of January data.