Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

79°F

26°C

Humidity 62%
Wind Speed Calm
Barometer 30.01 in (1015.4 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 17 Aug 7:54 pm CDT
Extended Forecast for

Saint Peters MO

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 65. Light and variable wind.

    Low: 65 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 88. Calm wind becoming south around 5 mph in the afternoon.

    High: 88 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am.  Increasing clouds, with a low around 70. Southeast wind around 6 mph becoming light and variable.

    Low: 70 °F

    Mostly Clear
    then Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 1pm.  Mostly cloudy, with a high near 84. Southeast wind around 6 mph becoming light and variable.

    High: 84 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 68. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 68 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms before 1pm.  Mostly sunny, with a high near 83.

    High: 83 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Friday Night

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

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 65. Light and variable wind.
Tuesday
Increasing clouds, with a high near 88. Calm wind becoming south around 5 mph in the afternoon.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Increasing clouds, with a low around 70. Southeast wind around 6 mph becoming light and variable.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 84. Southeast wind around 6 mph becoming light and variable.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Northeast wind around 5 mph becoming calm in the evening.
Thursday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 67.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 85.
Saturday Night
Mostly clear, with a low around 65.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
Partly cloudy, with a low around 65.
Monday
A 20 percent chance of showers. Partly sunny, with a high near 84.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Peters MO
 38.78°N 90.59°W (Elev. 492 ft)
6:11 pm CDT Aug 17, 2026
8pm CDT Aug 17, 2026-6pm CDT Aug 24, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database