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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

74°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 30.20 in (1021.8 mb)
Dewpoint 72°F (22°C)
Visibility 9.00 mi
Last update 17 Sep 12:54 am CDT
Extended Forecast for

Hillsboro MO

Heat Advisory September 17, 01:50am until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 17, 01:50am until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Overnight

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming west 5 to 7 mph in the morning.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 71. Light and variable wind.

    Low: 71 °F

    Mostly Clear

  • Friday

    Friday: A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny, with a high near 95. Heat index values as high as 102. Light southwest wind. Chance of precipitation is 20%.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

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

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 72. Calm wind.
Thursday
Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming west 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 71. Light and variable wind.
Friday
A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny, with a high near 95. Heat index values as high as 102. Light southwest wind. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 72. Light south wind.
Saturday
Mostly sunny, with a high near 96.
Saturday Night
Partly cloudy, with a low around 71.
Sunday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 92.
Sunday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 67.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 50%.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 79.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hillsboro MO
 38.23°N 90.56°W (Elev. 801 ft)
Last Update:
1:26 am CDT Sep 17, 2026
Forecast Valid:
1am CDT Sep 17, 2026-6pm CDT Sep 23, 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