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

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 >

Hazardous Weather Conditions

Current conditions at

Madison, Dane County Regional-Truax Field (KMSN)

Lat: 43.14°NLon: 89.35°WElev: 860ft.

Light Rain

65°F

18°C

Humidity 97%
Wind Speed E 5 mph
Barometer 29.94 in (1013.5 mb)
Dewpoint 64°F (18°C)
Visibility 9.00 mi
Last update 19 Sep 5:53 pm CDT
Extended Forecast for

Monona WI

Flood Watch September 19, 06:20pm until September 20, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 19, 06:20pm until September 20, 07:00am

    NOW until 7:00am Sun

    Flood Watch

  • Tonight

    Low: 59 °F

    Showers
    Likely

  • Sunday

    Sunday: Scattered showers, mainly before 9am. Mostly cloudy, with a high near 66. Northeast wind 10 to 15 mph. Chance of precipitation is 30%.

    High: 66 °F

    Scattered
    Showers then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 53. Northeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 64. East wind 10 to 15 mph.

    High: 64 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 49. Northeast wind 5 to 10 mph.

    Low: 49 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 62. Northeast wind around 10 mph.

    High: 62 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 48. Northeast wind around 5 mph.

    Low: 48 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 65. Northeast wind 5 to 10 mph.

    High: 65 °F

    Partly Sunny

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 4am, then scattered showers after 4am. Cloudy, with a low around 59. Northeast wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Scattered showers, mainly before 9am. Mostly cloudy, with a high near 66. Northeast wind 10 to 15 mph. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 53. Northeast wind 10 to 15 mph, with gusts as high as 30 mph.
Monday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 64. East wind 10 to 15 mph.
Monday Night
A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 49. Northeast wind 5 to 10 mph.
Tuesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 62. Northeast wind around 10 mph.
Tuesday Night
Partly cloudy, with a low around 48. Northeast wind around 5 mph.
Wednesday
Partly sunny, with a high near 65. Northeast wind 5 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 68.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Monona WI
 43.05°N 89.37°W (Elev. 850 ft)
Last Update:
5:32 pm CDT Sep 19, 2026
Forecast Valid:
6pm CDT Sep 19, 2026-6pm CDT Sep 26, 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