NWS Forecast for West Allis WI

National Weather Service Forecast for: West Allis WI
Issued by: National Weather Service Milwaukee, WI

Updated: 5:36 am CST Dec 22, 2025

Today Slight Chance Snow then Slight Chance Rain/Snow	Tonight Chance Sprinkles/Flurries then Mostly Cloudy	Tuesday Partly Sunny	Tuesday Night Mostly Cloudy	Wednesday Cloudy	Wednesday Night Slight Chance Rain then Cloudy	Christmas Day Cloudy	Thursday Night Chance Rain	Friday Partly Sunny
Hi 38 °F	Lo 33 °F	Hi 42 °F	Lo 28 °F	Hi 42 °F	Lo 37 °F	Hi 47 °F	Lo 38 °F	Hi 48 °F

Hazardous Weather Outlook

Today	A slight chance of snow before 2pm, then a slight chance of rain. Cloudy, with a high near 38. South wind 5 to 10 mph. Chance of precipitation is 20%.
Tonight	A chance of sprinkles and flurries before midnight. Mostly cloudy, with a low around 33. South wind around 5 mph becoming west after midnight.
Tuesday	Partly sunny, with a high near 42. West wind 5 to 10 mph.
Tuesday Night	Mostly cloudy, with a low around 28. West wind around 5 mph becoming calm in the evening.
Wednesday	Cloudy, with a high near 42. Southeast wind 5 to 10 mph.
Wednesday Night	A 20 percent chance of rain before midnight. Cloudy, with a low around 37. Southeast wind around 5 mph becoming calm.
Christmas Day	Cloudy, with a high near 47. Calm wind becoming east around 5 mph in the morning.
Thursday Night	A 50 percent chance of rain. Cloudy, with a low around 38. Southeast wind 5 to 10 mph becoming west after midnight.
Friday	Partly sunny, with a high near 48.
Friday Night	Mostly cloudy, with a low around 32.
Saturday	Mostly cloudy, with a high near 45.
Saturday Night	A slight chance of rain and snow. Mostly cloudy, with a low around 23. Chance of precipitation is 20%.
Sunday	Partly sunny, with a high near 30.

Forecast from NOAA-NWS for West Allis WI.