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

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fog/Mist

42°F

6°C

Humidity 92%
Wind Speed E 8 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 40°F (4°C)
Visibility 4.00 mi
Wind Chill37°F (3°C)
Last update 3 Mar 9:54 am CST
Extended Forecast for

Grafton IL

  • Today

    Today: Showers and possibly a thunderstorm. Patchy fog before 2pm. High near 51. Southeast wind 5 to 7 mph. Chance of precipitation is 80%.

    High: 51 °F

    Showers and
    Patchy Fog

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Patchy fog after 2am. Low around 47. Northeast wind 7 to 9 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before noon, then showers between noon and 3pm, then showers and possibly a thunderstorm after 3pm. Patchy fog before 11am. High near 60. East wind around 7 mph becoming south in the afternoon. Chance of precipitation is 90%.

    High: 60 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 53. Southwest wind around 6 mph. Chance of precipitation is 90%.

    Low: 53 °F

    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 66. Southwest wind 6 to 9 mph. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.

    Low: 56 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 57. Chance of precipitation is 80%.

    Low: 57 °F

    Chance
    Showers then
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 66.

    High: 66 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

Detailed Forecast

Today
Showers and possibly a thunderstorm. Patchy fog before 2pm. High near 51. Southeast wind 5 to 7 mph. Chance of precipitation is 80%.
Tonight
Showers and possibly a thunderstorm. Patchy fog after 2am. Low around 47. Northeast wind 7 to 9 mph. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm before noon, then showers between noon and 3pm, then showers and possibly a thunderstorm after 3pm. Patchy fog before 11am. High near 60. East wind around 7 mph becoming south in the afternoon. Chance of precipitation is 90%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 53. Southwest wind around 6 mph. Chance of precipitation is 90%.
Thursday
Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 66. Southwest wind 6 to 9 mph. Chance of precipitation is 60%.
Thursday Night
A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 57. Chance of precipitation is 80%.
Saturday
A 50 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 66.
Saturday Night
Mostly cloudy, with a low around 42.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 48.
Monday
A 20 percent chance of showers. Sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grafton IL
 38.98°N 90.42°W (Elev. 673 ft)
Last Update:
8:51 am CST Mar 3, 2026
Forecast Valid:
10am CST Mar 3, 2026-6pm CDT Mar 9, 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