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 >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

69°F

21°C

Humidity 84%
Wind Speed NW 5 mph
Barometer 29.90 in (1011.6 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Sep 5:54 am CDT
Extended Forecast for

Ellisville MO

  • Today

    Today: Partly sunny, with a high near 91. Southwest wind around 5 mph becoming light and variable.

    High: 91 °F

    Partly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 68. North wind 3 to 5 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. North wind around 6 mph. Chance of precipitation is 40%.

    High: 78 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 62. Northeast wind 5 to 7 mph.

    Low: 62 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 71. North wind around 8 mph.

    High: 71 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 91. Southwest wind around 5 mph becoming light and variable.
Tonight
A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 3am, then a chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 68. North wind 3 to 5 mph. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. North wind around 6 mph. Chance of precipitation is 40%.
Monday Night
Mostly cloudy, with a low around 62. Northeast wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 71. North wind around 8 mph.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Partly sunny, with a high near 76.
Friday Night
Mostly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ellisville MO
 38.58°N 90.57°W (Elev. 696 ft)
Last Update:
5:36 am CDT Sep 20, 2026
Forecast Valid:
6am CDT Sep 20, 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