Severe Thunderstorms and Heavy Rainfall for the Southwest; Heat Spreads Across the Center of the Nation

Moisture will continue to move into areas of the West. This will increase showers and thunderstorms coverage and intensity, with the risk of flash flooding and damaging wind gusts. Meanwhile, heat across the Southwest will expand into the center of the nation this weekend into early next week. Trends favor this heat will spread across the Ohio Valley, mid-Atlantic next week. Read More >

Hazardous Weather Conditions

Current conditions at

De Kalb Taylor Municipal Airport (KDKB)

Lat: 41.93°NLon: 88.71°WElev: 909ft.

Fair

69°F

21°C

Humidity 87%
Wind Speed S 12 mph
Barometer 30.02 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 29 Aug 11:15 pm CDT
Extended Forecast for

Marengo IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after midnight.  Mostly cloudy, with a low around 68. South wind around 10 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Scattered showers and thunderstorms, mainly after 3pm.  Partly sunny, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.  Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Scattered showers and thunderstorms before 10pm, then a slight chance of showers and thunderstorms after 4am.  Mostly cloudy, with a low around 70. South wind 5 to 10 mph.  Chance of precipitation is 30%.

    Low: 70 °F

    Scattered
    Showers then
    Slight Chance
    T-storms

  • Monday

    Monday: A 10 percent chance of showers and thunderstorms before 7am.  Partly sunny, with a high near 90. Heat index values as high as 96. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly cloudy, with a low around 72. South southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: Partly sunny, with a high near 91.

    High: 91 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers.  Partly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 68. South wind around 10 mph.
Sunday
Scattered showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Sunday Night
Scattered showers and thunderstorms before 10pm, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 70. South wind 5 to 10 mph. Chance of precipitation is 30%.
Monday
A 10 percent chance of showers and thunderstorms before 7am. Partly sunny, with a high near 90. Heat index values as high as 96. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72. South southwest wind around 5 mph, with gusts as high as 10 mph.
Tuesday
Partly sunny, with a high near 91.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
Mostly sunny, with a high near 91.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 69.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
Partly cloudy, with a low around 66.
Friday
Mostly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Marengo IL
 42.24°N 88.62°W
9:30 pm CDT Aug 29, 2026
11pm CDT Aug 29, 2026-6pm CDT Sep 5, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database