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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

90°F

32°C

Humidity 46%
Wind Speed E 6 mph
Barometer 29.88 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 20 Sep 2:50 pm CDT
Extended Forecast for

Staunton IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 89. West wind around 7 mph.

    High: 89 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 64. North wind 5 to 8 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: A 30 percent chance of showers, mainly before 9am. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 72. North wind 5 to 8 mph.

    High: 72 °F

    Chance
    Showers and
    Patchy Fog
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 58. Northeast wind 5 to 9 mph.

    Low: 58 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 72. Northeast wind 8 to 10 mph.

    High: 72 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 52.

    Low: 52 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 89. West wind around 7 mph.
Tonight
A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 64. North wind 5 to 8 mph. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers, mainly before 9am. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 72. North wind 5 to 8 mph.
Monday Night
Mostly cloudy, with a low around 58. Northeast wind 5 to 9 mph.
Tuesday
Partly sunny, with a high near 72. Northeast wind 8 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 52.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 77.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54.
Saturday
Mostly cloudy, with a high near 78.
Saturday Night
Mostly cloudy, with a low around 56.
Sunday
Partly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Staunton IL
 39.01°N 89.79°W (Elev. 627 ft)
Last Update:
2:36 pm CDT Sep 20, 2026
Forecast Valid:
3pm CDT Sep 20, 2026-6pm CDT Sep 27, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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