National Weather Service Forecast for: West Allis WI
Issued by: National Weather Service Milwaukee, WI
Updated: 12:12 am CST Dec 18, 2025
 
Overnight

Overnight: Rain likely, mainly after 5am. Cloudy, with a low around 31. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Rain Likely


 Thursday

Thursday: Rain before 2pm, then a slight chance of snow showers after 5pm. Temperature rising to near 42 by 9am, then falling to around 33 during the remainder of the day. South wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Rain then
Chance
Rain/Snow

 Thursday
Night
Thursday Night: Snow showers likely, mainly before 9pm, then a slight chance of snow after midnight. Mostly cloudy, with a low around 10. Wind chill values between -5 and 5. Breezy, with a west wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Breezy. Snow
Showers
Likely then
Slight Chance
Snow
 Friday

Friday: Mostly sunny, with a high near 24. Wind chill values between -5 and 5. Breezy, with a west wind 15 to 20 mph decreasing to 5 to 10 mph in the afternoon. Winds could gust as high as 30 mph.
Mostly Sunny
and Breezy
then Mostly
Sunny
 Friday
Night
Friday Night: Mostly cloudy, with a temperature rising to around 29 by 5am. South wind 5 to 10 mph.
Mostly Cloudy


 Saturday

Saturday: A slight chance of rain and snow. Mostly cloudy, with a high near 38. South wind 10 to 15 mph becoming west in the afternoon. Chance of precipitation is 20%.
Slight Chance
Rain/Snow

 Saturday
Night
Saturday Night: Mostly clear, with a low around 10. West wind 10 to 15 mph.
Mostly Clear


 Sunday

Sunday: Sunny, with a high near 20. West wind 5 to 10 mph.
Sunny


 Sunday
Night
Sunday Night: Increasing clouds, with a steady temperature around 18.
Increasing
Clouds
Lo 31 °F Hi 42 °F⇓ Lo 10 °F Hi 24 °F Lo 20 °F⇑ Hi 38 °F Lo 10 °F Hi 20 °F Lo 18 °F

 

Overnight
 
 Rain likely, mainly after 5am. Cloudy, with a low around 31. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
 
 Rain before 2pm, then a slight chance of snow showers after 5pm. Temperature rising to near 42 by 9am, then falling to around 33 during the remainder of the day. South wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Thursday Night
 
 Snow showers likely, mainly before 9pm, then a slight chance of snow after midnight. Mostly cloudy, with a low around 10. Wind chill values between -5 and 5. Breezy, with a west wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Friday
 
 Mostly sunny, with a high near 24. Wind chill values between -5 and 5. Breezy, with a west wind 15 to 20 mph decreasing to 5 to 10 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
 
 Mostly cloudy, with a temperature rising to around 29 by 5am. South wind 5 to 10 mph.
Saturday
 
 A slight chance of rain and snow. Mostly cloudy, with a high near 38. South wind 10 to 15 mph becoming west in the afternoon. Chance of precipitation is 20%.
Saturday Night
 
 Mostly clear, with a low around 10. West wind 10 to 15 mph.
Sunday
 
 Sunny, with a high near 20. West wind 5 to 10 mph.
Sunday Night
 
 Increasing clouds, with a steady temperature around 18.
Monday
 
 A 20 percent chance of snow after noon. Mostly cloudy, with a high near 36.
Monday Night
 
 Mostly cloudy, with a low around 30.
Tuesday
 
 Partly sunny, with a high near 41.
Tuesday Night
 
 Mostly cloudy, with a low around 27.
Wednesday
 
 Mostly cloudy, with a high near 39.

 

Forecast from NOAA-NWS for West Allis WI.