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Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Partly Cloudy

79°F

26°C

Humidity 42%
Wind Speed SW 9 mph
Barometer 30.07 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 24 Jul 4:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly clear, with a low around 59. South wind 5 to 10 mph becoming light in the evening.

    Low: 59 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 84. South wind 5 to 10 mph.

    High: 84 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 68. Southwest wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny and hot, with a high near 91. Heat index values as high as 99. Southwest wind 5 to 10 mph.

    High: 91 °F

    Hot

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 73. Southwest wind 5 to 10 mph.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny and hot, with a high near 91. Southwest wind 5 to 15 mph.

    High: 91 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69. North wind 5 to 10 mph.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. North wind 5 to 10 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 59. South wind 5 to 10 mph becoming light in the evening.
Saturday
Mostly sunny, with a high near 84. South wind 5 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 68. Southwest wind around 5 mph becoming calm in the evening.
Sunday
Partly sunny and hot, with a high near 91. Heat index values as high as 99. Southwest wind 5 to 10 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 73. Southwest wind 5 to 10 mph.
Monday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny and hot, with a high near 91. Southwest wind 5 to 15 mph.
Monday Night
Partly cloudy, with a low around 69. North wind 5 to 10 mph.
Tuesday
Mostly sunny, with a high near 89. North wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
2:42 pm CDT Jul 24, 2026
Forecast Valid:
5pm CDT Jul 24, 2026-6pm CDT Jul 31, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation