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

Perryville Regional Airport (KPCD)

Lat: 37.87°NLon: 89.86°WElev: 372ft.

Fair

73°F

23°C

Humidity 92%
Wind Speed E 3 mph
Barometer 30.24 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 17 Sep 7:35 am CDT
Extended Forecast for

Saint Mary MO

Heat Advisory September 17, 07:47am until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 17, 07:47am until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Today

    High: 97 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 72. Light southwest wind.

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 96. Heat index values as high as 105. Calm wind becoming west around 5 mph.

    High: 96 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

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

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Southwest wind 3 to 7 mph.

    High: 97 °F

    Hot

  • Saturday Night

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

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 95.

    High: 95 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny and hot, with a high near 97. Heat index values as high as 106. Light and variable wind becoming west 5 to 7 mph in the morning.
Tonight
Mostly clear, with a low around 72. Light southwest wind.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 96. Heat index values as high as 105. Calm wind becoming west around 5 mph.
Friday Night
Mostly clear, with a low around 72. Light south wind.
Saturday
Sunny and hot, with a high near 97. Southwest wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Mostly sunny, with a high near 95.
Sunday Night
Partly cloudy, with a low around 69.
Monday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 30%.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 61.
Wednesday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Mary MO
 37.88°N 89.95°W (Elev. 400 ft)
Last Update:
5:46 am CDT Sep 17, 2026
Forecast Valid:
7am 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