Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Overcast

68°F

20°C

Humidity 87%
Wind Speed Calm
Barometer 30.00 in (1015.4 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Jun 4:54 am CDT
Extended Forecast for

5 Miles WNW Grafton IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch
  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 67. Light west wind.

    Low: 67 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: Partly sunny, with a high near 83. Northwest wind 3 to 5 mph.

    High: 83 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 68. Northeast wind 5 to 8 mph becoming east after midnight.

    Low: 68 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms. Some of the storms could produce heavy rainfall.  High near 81. Southeast wind 9 to 13 mph becoming south in the afternoon. Winds could gust as high as 26 mph.  Chance of precipitation is 100%.

    High: 81 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am.  Low around 63. Southwest wind around 10 mph becoming north after midnight.  Chance of precipitation is 80%.

    Low: 63 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm.  Partly sunny, with a high near 76.

    High: 76 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Light west wind.
Saturday
Partly sunny, with a high near 83. Northwest wind 3 to 5 mph.
Saturday Night
Mostly cloudy, with a low around 68. Northeast wind 5 to 8 mph becoming east after midnight.
Sunday
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 81. Southeast wind 9 to 13 mph becoming south in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind around 10 mph becoming north after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 76.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 62.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WNW Grafton IL
 39°N 90.5°W (Elev. 801 ft)
2:56 am CDT Jun 20, 2026
5am CDT Jun 20, 2026-6pm CDT Jun 26, 2026
 
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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