Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Rain

61°F

16°C

Humidity 100%
Wind Speed E 3 mph
Barometer 30.04 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 19 Sep 4:55 am CDT
Extended Forecast for

2 Miles NW Janesville WI

Flood Watch September 19, 05:16am until September 19, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 19, 05:16am until September 19, 07:00pm

    NOW until 7:00pm Sat

    Flood Watch

  • Overnight

    Low: 62 °F

    Heavy Rain

  • Saturday

    Saturday: Showers and thunderstorms before 2pm, then showers and possibly a thunderstorm, mainly after 2pm. Some of the storms could produce heavy rainfall.  High near 72. South wind 10 to 15 mph.  Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 72 °F

    Heavy Rain

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before midnight, then scattered showers and thunderstorms between midnight and 4am, then scattered showers after 4am. Some of the storms could produce heavy rainfall.  Low around 60. Northeast wind 5 to 10 mph becoming northwest in the evening.  Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

    Low: 60 °F

    Heavy Rain
    then
    Scattered
    Showers

  • Sunday

    Sunday: Scattered showers, mainly before 1pm.  Mostly cloudy, with a high near 66. Northeast wind around 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 30%.

    High: 66 °F

    Scattered
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 53. Northeast wind 10 to 15 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers.  Mostly cloudy, with a high near 61. Northeast wind 10 to 15 mph.

    High: 61 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 47. Northeast wind 5 to 15 mph.

    Low: 47 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 60. Northeast wind 10 to 15 mph.

    High: 60 °F

    Partly Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 62. East wind around 15 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and thunderstorms before 2pm, then showers and possibly a thunderstorm, mainly after 2pm. Some of the storms could produce heavy rainfall. High near 72. South wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Saturday Night
Showers and possibly a thunderstorm before midnight, then scattered showers and thunderstorms between midnight and 4am, then scattered showers after 4am. Some of the storms could produce heavy rainfall. Low around 60. Northeast wind 5 to 10 mph becoming northwest in the evening. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Scattered showers, mainly before 1pm. Mostly cloudy, with a high near 66. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 53. Northeast wind 10 to 15 mph.
Monday
A 20 percent chance of showers. Mostly cloudy, with a high near 61. Northeast wind 10 to 15 mph.
Monday Night
Mostly cloudy, with a low around 47. Northeast wind 5 to 15 mph.
Tuesday
Partly sunny, with a high near 60. Northeast wind 10 to 15 mph.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Mostly sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Mostly sunny, with a high near 65.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Partly sunny, with a high near 69.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Janesville WI
 42.71°N 89.03°W (Elev. 768 ft)
4:01 am CDT Sep 19, 2026
5am CDT Sep 19, 2026-6pm CDT Sep 25, 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