National Weather Service Forecast for: Waukesha WI
Issued by: National Weather Service Milwaukee, WI
Updated: 3:32 am CDT Jun 22, 2026
 
Today

Today: Mostly sunny, with a high near 72. Northeast wind 5 to 10 mph.
Mostly Sunny

 Tonight

Tonight: Mostly clear, with a low around 51. Northeast wind 5 to 10 mph becoming light in the evening.
Mostly Clear

 Tuesday

Tuesday: Mostly sunny, with a high near 75. Calm wind becoming northeast around 5 mph in the afternoon.
Mostly Sunny

 Tuesday
Night
Tuesday Night: A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 55. Southeast wind around 5 mph becoming calm in the evening.
Partly Cloudy
then Chance
Showers
 Wednesday

Wednesday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 76. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers

 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 56. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Chance
Showers

 Thursday

Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Northwest wind 5 to 10 mph.
Mostly Sunny
then Slight
Chance
T-storms
 Thursday
Night
Thursday Night: Partly cloudy, with a low around 54. Northwest wind around 5 mph becoming calm in the evening.
Partly Cloudy

 Friday

Friday: Mostly sunny, with a high near 76.
Mostly Sunny
Hi 72 °F Lo 51 °F Hi 75 °F Lo 55 °F Hi 76 °F Lo 56 °F Hi 75 °F Lo 54 °F Hi 76 °F

 

Today
 
 Mostly sunny, with a high near 72. Northeast wind 5 to 10 mph.
Tonight
 
 Mostly clear, with a low around 51. Northeast wind 5 to 10 mph becoming light in the evening.
Tuesday
 
 Mostly sunny, with a high near 75. Calm wind becoming northeast around 5 mph in the afternoon.
Tuesday Night
 
 A 50 percent chance of showers after 1am. Mostly cloudy, with a low around 55. Southeast wind around 5 mph becoming calm in the evening.
Wednesday
 
 Showers likely, then showers and possibly a thunderstorm after 1pm. High near 76. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
 
 A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 56. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Thursday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 75. Northwest wind 5 to 10 mph.
Thursday Night
 
 Partly cloudy, with a low around 54. Northwest wind around 5 mph becoming calm in the evening.
Friday
 
 Mostly sunny, with a high near 76.
Friday Night
 
 Mostly cloudy, with a low around 56.
Saturday
 
 Mostly sunny, with a high near 78.
Saturday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Sunday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.

 

Forecast from NOAA-NWS for Waukesha WI.