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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

68°F

20°C

Humidity 78%
Wind Speed NW 3 mph
Barometer 30.06 in (1017.4 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 23 Aug 1:54 am CDT
Extended Forecast for

Old Monroe MO

  • Overnight

    Overnight: Clear, with a low around 62. Light northwest wind.

    Low: 62 °F

    Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 82. Calm wind becoming northwest 5 to 8 mph in the morning.

    High: 82 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Cloudy, then gradual clearing toward daybreak, with a low around 60. North wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Clearing Late

  • Monday

    Monday: Mostly sunny, with a high near 82. Calm wind becoming south around 5 mph.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 62. Light northwest wind.
Sunday
Increasing clouds, with a high near 82. Calm wind becoming northwest 5 to 8 mph in the morning.
Sunday Night
Cloudy, then gradual clearing toward daybreak, with a low around 60. North wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 82. Calm wind becoming south around 5 mph.
Monday Night
Partly cloudy, with a low around 63. Calm wind.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Partly cloudy, with a low around 67.
Wednesday
Mostly sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Sunny, with a high near 87.
Thursday Night
Mostly clear, with a low around 65.
Friday
Sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Old Monroe MO
 38.92°N 90.76°W (Elev. 436 ft)
Last Update:
1:26 am CDT Aug 23, 2026
Forecast Valid:
2am CDT Aug 23, 2026-6pm CDT Aug 29, 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