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.

Fog/Mist

70°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 70°F (21°C)
Visibility 4.00 mi
Last update 12 Aug 11:15 pm CDT
Extended Forecast for

Beloit WI

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Patchy Fog

  • Thursday

    Thursday: A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before midnight, then a chance of showers after 1am. Increasing clouds, with a low around 64. East wind around 5 mph. Chance of precipitation is 50%.

    Low: 64 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 79. East wind 5 to 10 mph. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 65. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 65 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 83. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 83 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Southwest 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.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Northwest wind 5 to 10 mph.

    High: 82 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 65. Calm wind.
Thursday
A chance of showers before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
A chance of showers and thunderstorms before midnight, then a chance of showers after 1am. Increasing clouds, with a low around 64. East wind around 5 mph. Chance of precipitation is 50%.
Friday
A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 79. East wind 5 to 10 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 65. East wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 83. Southeast wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Southwest 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.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Northwest wind 5 to 10 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 62.
Monday
Mostly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 59.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 62.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Beloit WI
 42.52°N 89.02°W (Elev. 745 ft)
Last Update:
11:22 pm CDT Aug 12, 2026
Forecast Valid:
11pm CDT Aug 12, 2026-6pm CDT Aug 19, 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