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

Dangerous Heat and Possible Flooding This Week

Hot temperatures and high humidity are forecast to continue across much of east Texas into the mid-Mississippi Valley through this week. Heavy to excessive rainfall occurring at times through Friday could bring areas of flooding across parts of the central Plains into the upper Midwest and Four Corners states. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

66°F

19°C

Humidity 88%
Wind Speed SE 6 mph
Barometer 30.02 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 15 Sep 3:55 am CDT
Extended Forecast for

Wood River IL

Heat Advisory September 15, 11:00am until September 15, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Sunny and hot, with a high near 100. Heat index values as high as 108. South wind 6 to 10 mph becoming west in the afternoon.

    High: 100 °F

    Sunny then
    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 73. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 73 °F

    T-storms
    Likely

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Partly sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming east around 5 mph in the morning.

    High: 97 °F

    Chance
    T-storms then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny and hot, with a high near 98. Light and variable wind becoming west 5 to 7 mph in the morning.

    High: 98 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 95.

    High: 95 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Sunny and hot, with a high near 100. Heat index values as high as 108. South wind 6 to 10 mph becoming west in the afternoon.
Tonight
Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 73. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 7am. Partly sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming east around 5 mph in the morning.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 75. South wind 3 to 5 mph.
Thursday
Sunny and hot, with a high near 98. Light and variable wind becoming west 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 73.
Friday
Sunny, with a high near 95.
Friday Night
Mostly clear, with a low around 72.
Saturday
Mostly sunny, with a high near 95.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 69.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Sunday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Wood River IL
 38.86°N 90.08°W (Elev. 436 ft)
Last Update:
2:01 am CDT Sep 15, 2026
Forecast Valid:
4am CDT Sep 15, 2026-6pm CDT Sep 21, 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