Dangerous Heat and Humidity Building from the Plains to the East Coast

A strengthening ridge of high pressure will produce much above average temperatures from the Plains to the East Coast, a true summer heat wave. Highs in the 90s and triple digits combined w/ humidity and dewpoints surging into the upper 70s, if not low 80s, will create heat indices as high as 110 to 115 through this weekend. Air quality will likely be poor due to haze and little air circulation. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Light Rain

75°F

24°C

Humidity 82%
Wind Speed Calm
Barometer 29.94 in (1013.4 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 18 Jul 5:53 am CDT
Extended Forecast for

Madison IL

Excessive Heat Warning until July 20, 08:00pm
Flood Warning until July 19, 07:00pm
Click here for hazard details and duration
Excessive Heat Warning
Flood Warning
  •  
    Excessive Heat Warning until July 20, 08:00pm
    Flood Warning until July 19, 07:00pm

    NOW: Multiple
    hazards in effect

    Click HERE for Details

  • Today

    Today: Mostly sunny and hot, with a high near 99. Heat index values as high as 111. Light southwest wind becoming south 6 to 11 mph in the morning.

    Hot

    High: 99 °F

  • Tonight

    Tonight: Clear, with a low around 80. South wind 7 to 10 mph.

    Clear

    Low: 80 °F

  • Friday

    Friday: Sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind 7 to 10 mph.

    Hot

    High: 99 °F

  • Friday
    Night

    Friday Night: Mostly clear, with a low around 79. South wind 6 to 9 mph.

    Mostly Clear

    Low: 79 °F

  • Saturday

    Saturday: Sunny and hot, with a high near 97. South wind 6 to 9 mph.

    Hot

    High: 97 °F

  • Saturday
    Night

    Saturday Night: Mostly clear, with a low around 79.

    Mostly Clear

    Low: 79 °F

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly after 1pm.  Mostly sunny, with a high near 94.

    Chance
    T-storms

    High: 94 °F

  • Sunday
    Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am.  Mostly cloudy, with a low around 74.

    Chance
    T-storms

    Low: 74 °F

Detailed Forecast

Today
Mostly sunny and hot, with a high near 99. Heat index values as high as 111. Light southwest wind becoming south 6 to 11 mph in the morning.
Tonight
Clear, with a low around 80. South wind 7 to 10 mph.
Friday
Sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind 7 to 10 mph.
Friday Night
Mostly clear, with a low around 79. South wind 6 to 9 mph.
Saturday
Sunny and hot, with a high near 97. South wind 6 to 9 mph.
Saturday Night
Mostly clear, with a low around 79.
Sunday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 94.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 74.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 89.
Monday Night
Mostly clear, with a low around 68.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 87.
Click Map For Forecast
Point Forecast:
Madison IL
 38.68°N 90.14°W (Elev. 407 ft)
6:13 am CDT Jul 18, 2019
6am CDT Jul 18, 2019-6pm CDT Jul 24, 2019
 
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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