Dangerous heat and humidity from the central U.S. to East Coast this weekend

Hot and very humid conditions will push the heat index to well over 100 degrees across a large portion of the central and eastern U.S. Excessive Heat Warnings and Heat Advisories are in effect for much of the Plains, Miss. Valley, Midwest, Ohio Valley, Mid-Atlantic and southern states. Be very cautious if you must do outdoor activities in these areas during the afternoon and evening this weekend. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

74°F

23°C

Humidity 91%
Wind Speed S 3 mph
Barometer 29.98 in (1014.7 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 23 Jul 3:53 am CDT
Extended Forecast for

Collinsville IL

Excessive Heat Warning until July 24, 08:00pm
Click here for hazard details and duration
Excessive Heat Warning
  •  
    Excessive Heat Warning until July 24, 08:00pm

    NOW until
    8:00pm Sun

    Excessive Heat Warning

  • Overnight

    Overnight: Mostly clear, with a low around 73. Calm wind.

    Mostly Clear

    Low: 73 °F

  • Saturday

    Saturday: Isolated showers and thunderstorms after 2pm.  Mostly sunny, with a high near 96. Heat index values as high as 107. Calm wind becoming east around 6 mph in the afternoon.  Chance of precipitation is 20%.

    Mostly Sunny
    then Isolated
    T-storms

    High: 96 °F

  • Saturday
    Night

    Saturday Night: Isolated showers and thunderstorms before 8pm.  Mostly clear, with a low around 77. Southeast wind 5 to 7 mph.  Chance of precipitation is 20%.

    Isolated
    T-storms then
    Mostly Clear

    Low: 77 °F

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms after 8am.  Mostly sunny, with a high near 96. Heat index values as high as 110. South wind around 6 mph.

    Chance
    T-storms

    High: 96 °F

  • Sunday
    Night

    Sunday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 76. South wind 5 to 7 mph becoming calm  after midnight.

    Chance
    T-storms

    Low: 76 °F

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms.  Partly sunny, with a high near 90.

    Chance
    T-storms

    High: 90 °F

  • Monday
    Night

    Monday Night: A 50 percent chance of showers and thunderstorms, mainly before 8pm.  Partly cloudy, with a low around 72.

    Chance
    T-storms then
    Slight Chance
    T-storms

    Low: 72 °F

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 90.

    Slight Chance
    T-storms

    High: 90 °F

Detailed Forecast

Overnight
Mostly clear, with a low around 73. Calm wind.
Saturday
Isolated showers and thunderstorms after 2pm. Mostly sunny, with a high near 96. Heat index values as high as 107. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 20%.
Saturday Night
Isolated showers and thunderstorms before 8pm. Mostly clear, with a low around 77. Southeast wind 5 to 7 mph. Chance of precipitation is 20%.
Sunday
A 30 percent chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 96. Heat index values as high as 110. South wind around 6 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 76. South wind 5 to 7 mph becoming calm after midnight.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Monday Night
A 50 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 72.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after 8am. Partly sunny, with a high near 89.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Click Map For Forecast
Point Forecast:
Collinsville IL
 38.68°N 90°W (Elev. 499 ft)
3:30 am CDT Jul 23, 2016
4am CDT Jul 23, 2016-6pm CDT Jul 29, 2016
 
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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