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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

80°F

27°C

Humidity 58%
Wind Speed SE 3 mph
Barometer 30.04 in (1016.9 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 12 Sep 7:53 pm CDT
Extended Forecast for

Lemay MO

  • Tonight

    Tonight: Partly cloudy, with a low around 69. South wind 3 to 6 mph.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 98. Heat index values as high as 101. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 20%.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71. South wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 103. Light and variable wind. Chance of precipitation is 20%.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Partly sunny, with a high near 96. Chance of precipitation is 20%.

    High: 96 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 69. South wind 3 to 6 mph.
Saturday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 98. Heat index values as high as 101. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 71. South wind around 5 mph becoming calm in the evening.
Sunday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 103. Light and variable wind. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 72. Calm wind.
Monday
A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Partly sunny, with a high near 96. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 70.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
A 20 percent chance of showers after 1pm. Sunny, with a high near 96.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
A 20 percent chance of showers. Partly sunny, with a high near 91.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lemay MO
 38.53°N 90.26°W (Elev. 381 ft)
Last Update:
7:46 pm CDT Sep 12, 2025
Forecast Valid:
8pm CDT Sep 12, 2025-6pm CDT Sep 19, 2025
 
Forecast Discussion
 
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Additional Resources

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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