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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

96°F

36°C

Humidity 34%
Wind Speed SW 9 mph
Barometer 29.88 in (1010.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 19 Sep 4:51 pm CDT
Extended Forecast for

Overland MO

Heat Advisory September 19, 05:52pm until September 19, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory September 19, 05:52pm until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers between 3pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 93. West wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 69. North wind 6 to 9 mph becoming northeast after midnight. Chance of precipitation is 70%.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Northeast wind 6 to 8 mph. Chance of precipitation is 50%.

    High: 80 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 62. Northeast wind 6 to 9 mph.

    Low: 62 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 72.

    High: 72 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 75. Light and variable wind becoming west 5 to 7 mph in the evening.
Sunday
A slight chance of showers between 3pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 93. West wind 3 to 6 mph. Chance of precipitation is 20%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Increasing clouds, with a low around 69. North wind 6 to 9 mph becoming northeast after midnight. Chance of precipitation is 70%.
Monday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Northeast wind 6 to 8 mph. Chance of precipitation is 50%.
Monday Night
A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 62. Northeast wind 6 to 9 mph.
Tuesday
Mostly cloudy, with a high near 72.
Tuesday Night
Mostly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
Partly sunny, with a high near 76.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 61.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 79.
Friday Night
Mostly cloudy, with a low around 62.
Saturday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Overland MO
 38.69°N 90.37°W (Elev. 600 ft)
Last Update:
4:36 pm CDT Sep 19, 2026
Forecast Valid:
5pm CDT Sep 19, 2026-6pm CDT Sep 26, 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