Dangerous Heat Builds and Expands; Critical Fire Weather for the Southwest; Severe Thunderstorms for Plains and Midwest

Dangerous to record breaking heat will build across the center of the nation and slowly build eastward this week. Wildfire conditions remain critical for the Southwest and portions of the Great Basin through Monday. For the northern Plains and upper Midwest, severe thunderstorms with the potential for large to very large hail and severe winds are the primary hazards. Read More >

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Partly Cloudy

81°F

27°C

Humidity 84%
Wind Speed S 12 G 20 mph
Barometer 29.89 in
Dewpoint 75°F (24°C)
Visibility 7.00 mi
Heat Index87°F (31°C)
Last update 29 Jun 8:45 am CDT
Extended Forecast for

2 Miles W Darien WI

Extreme Heat Warning June 29, 12:00pm until June 30, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  • Today

    Today: Mostly sunny and hot, with a high near 93. Heat index values as high as 103. South wind around 15 mph, with gusts as high as 25 mph.

    High: 93 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 75. South wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 94. Heat index values as high as 106. Southwest wind around 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 75. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 75 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 94. Southwest wind 10 to 15 mph.

    High: 94 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75. Southwest wind around 10 mph.

    Low: 75 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny and hot, with a high near 93. Southwest wind 10 to 15 mph.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms.  Partly cloudy, with a low around 73. Southwest wind 5 to 10 mph.  Chance of precipitation is 50%.

    Low: 73 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny and hot, with a high near 93. Heat index values as high as 103. South wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 75. South wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday
Mostly sunny and hot, with a high near 94. Heat index values as high as 106. Southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 75. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Sunny and hot, with a high near 94. Southwest wind 10 to 15 mph.
Wednesday Night
Mostly clear, with a low around 75. Southwest wind around 10 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 93. Southwest wind 10 to 15 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southwest wind 5 to 10 mph. Chance of precipitation is 50%.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Friday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Independence Day
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Darien WI
 42.59°N 88.75°W (Elev. 889 ft)
9:07 am CDT Jun 29, 2026
9am CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database