Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

Galesburg Municipal Airport (KGBG)

Lat: 40.93°NLon: 90.43°WElev: 751ft.

Fair

64°F

18°C

Humidity 100%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 18 Aug 12:55 am CDT
Extended Forecast for

Monmouth IL

  • Overnight

    Overnight: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 4pm.  Partly sunny, with a high near 79. Southwest wind 5 to 10 mph.  Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms between 8pm and 4am, then a slight chance of showers.  Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm.  Chance of precipitation is 50%.

    Low: 65 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 78. Calm wind becoming northeast around 5 mph in the morning.

    High: 78 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers.  Partly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 62. Calm wind.
Tuesday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 79. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms between 8pm and 4am, then a slight chance of showers. Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm. Chance of precipitation is 50%.
Wednesday
Partly sunny, with a high near 78. Calm wind becoming northeast around 5 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 61.
Thursday
Sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 61.
Friday
Sunny, with a high near 79.
Friday Night
A 40 percent chance of showers. Partly cloudy, with a low around 63.
Saturday
Mostly sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Mostly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 59.
Monday
Partly sunny, with a high near 76.
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ABOUT THIS FORECAST

 
Point Forecast:
Monmouth IL
 40.9°N 90.65°W (Elev. 774 ft)
9:16 pm CDT Aug 17, 2026
1am CDT Aug 18, 2026-6pm CDT Aug 24, 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