Milwaukee Weather: Mostly Sunny Saturday, cooler near the lake

Published June 27, 2026 7:39 AM CDT

Forecast from FOX6 Chief Meteorologist Rob Haswell

The quiet weekend weather is coming to an end as heat and humidity quickly build across southern Wisconsin starting Sunday and intensify next week. Monday through at least Wednesday looks like a stretch of dangerous heat, with afternoon heat indices climbing above 100 degrees in many areas and nighttime temperatures staying in the 70s. While scattered showers and thunderstorms are possible late Sunday and then on a daily basis Tuesday through Friday, they won't do much to end the overall hot pattern. Tuesday currently looks like the hottest day of the week, though cloud cover and storm chances could influence just how high temperatures climb later in the week. Regardless of the exact numbers, plan for several days of potentially hazardous heat if you'll be spending time outdoors.

Tonight:  Partly cloudy.
Low:      58°
Wind:     NE 5-10

Sunday:   78 Lake. Partly sunny with a slight chance for a shower or storm in the evening.
High:     82°
Wind:     SE 5-15

Monday:   Mostly sunny, breezy, hot and humid. Heat Index: 98-102°
AM Low:   67°                   High:  94°
Wind:     S 5-15

Tuesday:  Mostly sunny, breezy, hot and humid. Heat Index: 100-104°
AM Low:   74°                   High:  96°
Wind:     SW 5-15

Wednesday: Mostly sunny, hot and humid. Heat Index: 100-104°
AM Low:   76°                   High:  96°
Wind:     SW 5-15

Thursday: Partly sunny, hot and humid. Afternoon showers and storms possible. Heat Index: 100-104°
AM Low:   76°                   High:  94°
Wind:     SW 5-15

Friday:   Partly sunny, hot and humid. Showers and thunderstorms possible. Heat Index: 100-104°
AM Low:   76°                   High:  90°
Wind:     SW 5-15

6-day planner

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