National Weather Service Forecast for: Waukesha WI
Issued by: National Weather Service Milwaukee, WI
Updated: 12:27 pm CDT May 4, 2026
 
This
Afternoon
This Afternoon: Mostly sunny, with a high near 76. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Mostly Sunny
and Breezy

Tonight

Tonight: A chance of rain and thunderstorms before 10pm, then a slight chance of showers after 1am.  Mostly cloudy, with a low around 43. Northwest wind 5 to 10 mph.  Chance of precipitation is 40%.
Chance
T-storms then
Slight Chance
Showers
Tuesday

Tuesday: Partly sunny, with a high near 56. Northwest wind 5 to 10 mph.
Partly Sunny

Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 37. Northwest wind around 5 mph becoming calm  in the evening.
Mostly Cloudy

Wednesday

Wednesday: Areas of frost before 7am.  Otherwise, partly sunny, with a high near 54. Northwest wind 5 to 10 mph.
Areas Frost
then Partly
Sunny
Wednesday
Night
Wednesday Night: Areas of frost after 3am.  Otherwise, mostly cloudy, with a low around 35. Northwest wind around 5 mph becoming calm  in the evening.
Mostly Cloudy
then Areas
Frost
Thursday

Thursday: A 20 percent chance of showers after 1pm.  Areas of frost before 8am.  Otherwise, mostly sunny, with a high near 57. Light west wind increasing to 5 to 10 mph in the morning.
Areas Frost
then Slight
Chance
Showers
Thursday
Night
Thursday Night: Mostly cloudy, with a low around 39. West wind around 5 mph becoming calm  in the evening.
Mostly Cloudy

Friday

Friday: A 20 percent chance of showers after 1pm.  Partly sunny, with a high near 62.
Partly Sunny
then Slight
Chance
Showers
Hi 76 °F Lo 43 °F Hi 56 °F Lo 37 °F Hi 54 °F Lo 35 °F Hi 57 °F Lo 39 °F Hi 62 °F

Special Weather Statement
Hazardous Weather Outlook
 

This Afternoon
 
Mostly sunny, with a high near 76. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
 
A chance of rain and thunderstorms before 10pm, then a slight chance of showers after 1am. Mostly cloudy, with a low around 43. Northwest wind 5 to 10 mph. Chance of precipitation is 40%.
Tuesday
 
Partly sunny, with a high near 56. Northwest wind 5 to 10 mph.
Tuesday Night
 
Mostly cloudy, with a low around 37. Northwest wind around 5 mph becoming calm in the evening.
Wednesday
 
Areas of frost before 7am. Otherwise, partly sunny, with a high near 54. Northwest wind 5 to 10 mph.
Wednesday Night
 
Areas of frost after 3am. Otherwise, mostly cloudy, with a low around 35. Northwest wind around 5 mph becoming calm in the evening.
Thursday
 
A 20 percent chance of showers after 1pm. Areas of frost before 8am. Otherwise, mostly sunny, with a high near 57. Light west wind increasing to 5 to 10 mph in the morning.
Thursday Night
 
Mostly cloudy, with a low around 39. West wind around 5 mph becoming calm in the evening.
Friday
 
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 62.
Friday Night
 
Partly cloudy, with a low around 40.
Saturday
 
Mostly sunny, with a high near 66.
Saturday Night
 
Mostly cloudy, with a low around 44.
Sunday
 
A 20 percent chance of showers. Partly sunny, with a high near 64.

 

Forecast from NOAA-NWS for Waukesha WI.