National Weather Service United States Department of Commerce

Oppressive heat and humidity building into the central and southeast U.S.

A heat wave is building into parts of the central and southeast U.S. this week. The combination of heat and humidity will lead to dangerous heat indices, especially in parts of the central Mississippi River Valley where an Excessive Heat Warning is in effect. Heat Advisories are in effect elsewhere across the region. Relief is not expected for several days.
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Current Conditions

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Portage WI

7 Day Forecast

For More Weather Information:

Milwaukee, WI Local Forecast Office

Overnight

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

Low: 64 °F

Thursday

Severe Thunderstorms Chance for Measurable Precipitation 60%

Severe
Thunderstorms

High: 83 °F

Thursday
Night

Thunderstorms Likely Chance for Measurable Precipitation 60%

Thunderstorms
Likely

Low: 69 °F

Friday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 89 °F

Friday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 66 °F

Saturday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 84 °F

Saturday
Night

Chance Thunderstorms Chance for Measurable Precipitation 40%

Chance
Thunderstorms

Low: 68 °F

Sunday

Chance Thunderstorms Chance for Measurable Precipitation 30%

Chance
Thunderstorms

High: 86 °F

Sunday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 67 °F

Detailed Forecast

  • Overnight A slight chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Patchy fog after 4am. Otherwise, mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.
  • Thursday Showers and thunderstorms likely, mainly after 1pm. Some of the storms could be severe. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 83. Calm wind becoming southeast around 5 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
  • Thursday Night Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 69. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
  • Friday A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. Heat index values as high as 98. South wind around 5 mph becoming northwest in the afternoon.
  • Friday Night A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm after midnight.
  • Saturday A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. East wind 5 to 10 mph.
  • Saturday Night A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southeast wind around 5 mph.
  • Sunday A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Southeast wind 5 to 10 mph becoming southwest in the afternoon.
  • Sunday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
  • Monday A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
  • Monday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
  • Tuesday A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
  • Tuesday Night A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
  • Wednesday A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.