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

Lowell to Impact Hawaii; Heat Persists in the South-Central U.S.

Hurricane Lowell is forecast to pass west of Kauai`s coastal waters tonight. Impacts such as high surf and heavy rain could impact all of the islands. Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley into this week with limited nighttime relief. Periods of moderate to heavy rainfall will be possible through Tuesday morning in the northern Rockies. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

80°F

27°C

Humidity 49%
Wind Speed SE 8 mph
Barometer 30.11 in (1019.4 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 7 Sep 10:53 am CDT
Extended Forecast for

Barnhart MO

  • Labor Day

    Labor Day: Sunny, with a high near 89. East wind around 7 mph.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. East wind around 6 mph becoming calm after midnight.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 95. Calm wind becoming south around 5 mph in the afternoon.

    High: 95 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. South wind 3 to 6 mph.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98. South wind 5 to 7 mph.

    High: 98 °F

    Sunny then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 69. Chance of precipitation is 90%.

    Low: 69 °F

    Chance
    T-storms then
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 84. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

Detailed Forecast

Labor Day
Sunny, with a high near 89. East wind around 7 mph.
Tonight
Mostly clear, with a low around 61. East wind around 6 mph becoming calm after midnight.
Tuesday
Mostly sunny, with a high near 95. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 71. South wind 3 to 6 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98. South wind 5 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 69. Chance of precipitation is 90%.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 84. Chance of precipitation is 60%.
Thursday Night
Partly cloudy, with a low around 62.
Friday
Mostly sunny, with a high near 87.
Friday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Saturday Night
Mostly clear, with a low around 67.
Sunday
A 20 percent chance of showers. Sunny, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Barnhart MO
 38.34°N 90.41°W (Elev. 597 ft)
Last Update:
8:11 am CDT Sep 7, 2026
Forecast Valid:
11am CDT Sep 7, 2026-6pm CDT Sep 13, 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