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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Overcast

71°F

22°C

Humidity 76%
Wind Speed SW 7 mph
Barometer 29.66 in (1003.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 1 Aug 4:54 am CDT
Extended Forecast for

4 Miles SW Carrollton IL

  • Overnight

    Overnight: Scattered showers. Cloudy, with a low around 66. West wind around 6 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Scattered
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm. Patchy fog between 1pm and 2pm. High near 75. West wind 7 to 15 mph becoming north in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.

    High: 75 °F

    Scattered
    Showers then
    Showers and
    Patchy Fog

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely before midnight, then isolated showers between midnight and 4am. Cloudy, with a low around 64. North wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely then
    Isolated
    Showers

  • Sunday

    Sunday: Mostly cloudy, then gradually becoming sunny, with a high near 79. North wind around 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Decreasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61. North wind 5 to 9 mph becoming light in the evening.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

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

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Overnight
Scattered showers. Cloudy, with a low around 66. West wind around 6 mph. Chance of precipitation is 40%.
Saturday
Showers and possibly a thunderstorm. Patchy fog between 1pm and 2pm. High near 75. West wind 7 to 15 mph becoming north in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.
Saturday Night
Showers and thunderstorms likely before midnight, then isolated showers between midnight and 4am. Cloudy, with a low around 64. North wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Sunday
Mostly cloudy, then gradually becoming sunny, with a high near 79. North wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 61. North wind 5 to 9 mph becoming light in the evening.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 62.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 86.
Wednesday Night
A 40 percent chance of showers and thunderstorms. 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 69.
Friday
A 30 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:
4 Miles SW Carrollton IL
 39.25°N 90.46°W (Elev. 600 ft)
Last Update:
5:21 am CDT Aug 1, 2026
Forecast Valid:
5am CDT Aug 1, 2026-6pm CDT Aug 7, 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