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.

A Few Clouds

66°F

19°C

Humidity 90%
Wind Speed N 12 G 21 mph
Barometer 29.80 in (1008.8 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 2 Aug 5:54 am CDT
Extended Forecast for

3 Miles WNW Grafton IL

  • Today

    Today: Mostly sunny, with a high near 81. North wind 9 to 13 mph, with gusts as high as 23 mph.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. North wind 5 to 9 mph becoming light after midnight.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 84. Northeast wind 3 to 5 mph.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 65. East wind around 5 mph becoming calm after midnight.

    Low: 65 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. Light southeast wind.

    High: 86 °F

    Sunny

  • Tuesday Night

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

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 85. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 81. North wind 9 to 13 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 64. North wind 5 to 9 mph becoming light after midnight.
Monday
Sunny, with a high near 84. Northeast wind 3 to 5 mph.
Monday Night
Mostly clear, with a low around 65. East wind around 5 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 86. Light southeast wind.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 88.
Wednesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 85. Chance of precipitation is 60%.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Grafton IL
 39°N 90.47°W (Elev. 801 ft)
Last Update:
6:21 am CDT Aug 2, 2026
Forecast Valid:
6am CDT Aug 2, 2026-6pm CDT Aug 8, 2026
 
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