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. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Light Rain Fog/Mist

72°F

22°C

Humidity 87%
Wind Speed NW 9 mph
Barometer 29.67 in (1004.4 mb)
Dewpoint 68°F (20°C)
Visibility 5.00 mi
Last update 1 Aug 3:54 pm CDT
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: Showers likely.  Cloudy, with a high near 74. Northwest wind around 11 mph.  Chance of precipitation is 60%.

    High: 74 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers and thunderstorms before 2am, then patchy drizzle after 4am.  Cloudy, with a low around 65. Breezy, with a north wind 17 to 20 mph, with gusts as high as 28 mph.  Chance of precipitation is 60%.

    Low: 65 °F

    Breezy.
    Showers then
    Areas Drizzle

  • Sunday

    Sunday: Partly sunny, with a high near 81. North wind 16 to 18 mph, with gusts as high as 26 mph.

    High: 81 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64. North wind 5 to 13 mph.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 84. North wind 5 to 7 mph.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Tuesday Night

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

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers likely. Cloudy, with a high near 74. Northwest wind around 11 mph. Chance of precipitation is 60%.
Tonight
Showers and thunderstorms before 2am, then patchy drizzle after 4am. Cloudy, with a low around 65. Breezy, with a north wind 17 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 81. North wind 16 to 18 mph, with gusts as high as 26 mph.
Sunday Night
Partly cloudy, with a low around 64. North wind 5 to 13 mph.
Monday
Sunny, with a high near 84. North wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 64.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Friday Night
Partly cloudy, with a low around 72.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
1:26 pm CDT Aug 1, 2026
4pm CDT Aug 1, 2026-6pm CDT Aug 8, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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