Hot Weather in the West; Heavy Rainfall and Flooding in the Southwest

Hot to extremely hot temperatures are in place much of this week across parts of California and the interior Northwest U.S, with the Pacific Northwest carrying the potential for record-breaking high temperatures. Monsoonal moisture over the Southwest U.S. may lead to heavy rainfall and instances of flash flooding through Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Mostly Cloudy

75°F

24°C

Humidity 50%
Wind Speed Vrbl 5 mph
Barometer 30.06 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 2 Sep 1:45 pm CDT
Extended Forecast for

Janesville WI

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 77. West wind around 5 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 4am.  Partly cloudy, with a low around 58. Calm wind becoming southwest around 5 mph after midnight.

    Low: 58 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely before 3pm, then a slight chance of showers between 3pm and 4pm.  Mostly cloudy, with a high near 68. Southwest wind 5 to 10 mph becoming northwest in the afternoon.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 68 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. Northwest wind 5 to 10 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 63. Light northwest wind becoming west 5 to 10 mph in the morning.

    High: 63 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers likely, mainly after 1am.  Mostly cloudy, with a low around 50. South wind 5 to 15 mph.  Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 50 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Mostly sunny, with a high near 61. West wind around 15 mph.

    High: 61 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 44. West wind 5 to 10 mph.

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 77. West wind around 5 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 58. Calm wind becoming southwest around 5 mph after midnight.
Wednesday
Showers and thunderstorms likely before 3pm, then a slight chance of showers between 3pm and 4pm. Mostly cloudy, with a high near 68. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Partly cloudy, with a low around 42. Northwest wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 63. Light northwest wind becoming west 5 to 10 mph in the morning.
Thursday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 50. South wind 5 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Mostly sunny, with a high near 61. West wind around 15 mph.
Friday Night
Mostly clear, with a low around 44. West wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Mostly clear, with a low around 43.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 45.
Monday
Partly sunny, with a high near 68.
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
2:24 pm CDT Sep 2, 2025
2pm CDT Sep 2, 2025-6pm CDT Sep 8, 2025
 
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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