National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

72°F

22°C

Humidity 88%
Wind Speed S 5 mph
Barometer 29.93 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 31 Aug 1:55 am CDT
Extended Forecast for

Beloit WI

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 70. South wind around 5 mph.

    Low: 70 °F

    Chance
    T-storms and
    Patchy Fog

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Partly sunny, with a high near 87. Southwest wind around 10 mph.

    High: 87 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 89. Heat index values as high as 99. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 90. Light south wind becoming southwest 5 to 10 mph in the morning.

    High: 90 °F

    Hot

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. West wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Partly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85. Calm wind becoming east around 5 mph in the morning.

    High: 85 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.

    Low: 67 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Patchy fog. Otherwise, mostly cloudy, with a low around 70. South wind around 5 mph.
Monday
A 40 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Partly sunny, with a high near 87. Southwest wind around 10 mph.
Monday Night
Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening.
Tuesday
A slight chance of showers and thunderstorms before 8am, then a slight chance of showers and thunderstorms after 11am. Mostly sunny, with a high near 89. Heat index values as high as 99. Light southwest wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Wednesday
Mostly sunny and hot, with a high near 90. Light south wind becoming southwest 5 to 10 mph in the morning.
Wednesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69. West wind around 5 mph becoming calm in the evening.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85. Calm wind becoming east around 5 mph in the morning.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Beloit WI
 42.52°N 89.02°W (Elev. 745 ft)
Last Update:
1:21 am CDT Aug 31, 2026
Forecast Valid:
2am CDT Aug 31, 2026-6pm CDT Sep 6, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation