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.

Thunderstorm in Vicinity Light Rain Fog/Mist

22°C

72°F

Humidity 94%
Wind Speed NE 15 km/h
Barometer 1016.0 mb (30.02 in)
Dewpoint 21°C (70°F)
Visibility 2.41 km
Last update 13 Jul 12:54 pm CDT
Extended Forecast for

3 Miles NNE Grafton IL

  • This Afternoon

    This Afternoon: Showers and thunderstorms likely, mainly before 4pm. Cloudy, with a high near 28. Northeast wind 5 to 8 km/h. Chance of precipitation is 70%.

    High: 28 °C

    T-storms
    Likely

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Patchy fog after 5am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 20. Calm wind.

    Low: 20 °C

    Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 30. Calm wind becoming southeast 5 to 8 km/h in the afternoon.

    High: 30 °C

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22. Southeast wind 5 to 10 km/h becoming calm in the evening.

    Low: 22 °C

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 32. Southeast wind 5 to 11 km/h becoming south in the afternoon.

    High: 32 °C

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.

    Low: 23 °C

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 33.

    High: 33 °C

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 22.

    Low: 22 °C

    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 31.

    High: 31 °C

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Showers and thunderstorms likely, mainly before 4pm. Cloudy, with a high near 28. Northeast wind 5 to 8 km/h. Chance of precipitation is 70%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Patchy fog after 5am. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 20. Calm wind.
Monday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 30. Calm wind becoming southeast 5 to 8 km/h in the afternoon.
Monday Night
Partly cloudy, with a low around 22. Southeast wind 5 to 10 km/h becoming calm in the evening.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 32. Southeast wind 5 to 11 km/h becoming south in the afternoon.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 33.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 22.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 31.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 21.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 29.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 22.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 31.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Grafton IL
 39.02°N 90.41°W (Elev. 614 m)
Last Update:
12:21 pm CDT Jul 13, 2025
Forecast Valid:
1pm CDT Jul 13, 2025-6pm CDT Jul 19, 2025
 
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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