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

Heat Builds in the West; Extremely Critical Fire Weather in the Northwest

A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Critical to extremely critical fire weather conditions are forecast from the Northwest and the northern Great Basin this weekend. Particularly Dangerous Situation Red Flag Warnings have been issued. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

70°F

21°C

Humidity 82%
Wind Speed N 10 mph
Barometer 29.83 in (1009.9 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 2 Aug 8:53 am CDT
Extended Forecast for

4 Miles SSW Mascoutah IL

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 81. North wind 11 to 14 mph, with gusts as high as 22 mph.

    High: 81 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly clear, with a low around 65. North wind 5 to 9 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 64. Light east wind.

    Low: 64 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 87. Calm wind.

    High: 87 °F

    Sunny

  • Tuesday Night

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

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.

    High: 87 °F

    Chance
    Showers

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 81. North wind 11 to 14 mph, with gusts as high as 22 mph.
Tonight
Mostly clear, with a low around 65. North wind 5 to 9 mph becoming calm in the evening.
Monday
Sunny, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.
Monday Night
Clear, with a low around 64. Light east wind.
Tuesday
Sunny, with a high near 87. Calm wind.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 90.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 71.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Friday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Mascoutah IL
 38.45°N 89.84°W (Elev. 433 ft)
Last Update:
6:21 am CDT Aug 2, 2026
Forecast Valid:
9am CDT Aug 2, 2026-6pm CDT Aug 8, 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