National Weather Service

News Headlines

August 9, 2026: Two Rounds of Severe Thunderstorms, Including Late Night Tornadoes in North-Central Illinois
August 11, 2026: Powerful Morning Derecho Produces Widespread Wind Damage and Tornadoes Across Northern Illinois and Northwest Indiana

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

De Kalb Taylor Municipal Airport (KDKB)

Lat: 41.93°NLon: 88.71°WElev: 909ft.

Mostly Cloudy

69°F

21°C

Humidity	95%
Wind Speed	S 7 mph
Barometer	29.96 in
Dewpoint	68°F (20°C)
Visibility	10.00 mi
Last update	21 Aug 8:35 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles SSW Marengo IL

Tonight
Low: 61 °F
Severe
Thunderstorms
then Partly
Cloudy
Saturday
High: 78 °F
Sunny
Saturday Night
Low: 56 °F
Mostly Clear
Sunday
High: 75 °F
Sunny
Sunday Night
Low: 53 °F
Mostly Clear
Monday
High: 76 °F
Mostly Sunny
Monday Night
Low: 58 °F
Partly Cloudy
Tuesday
High: 78 °F
Mostly Sunny
Tuesday Night
Low: 63 °F
Mostly Cloudy
then Chance
Showers

Detailed Forecast

Tonight

Showers and thunderstorms likely, mainly before 10pm. Some of the storms could be severe and produce heavy rainfall. Mostly cloudy, with a low around 61. Southwest wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Saturday

Sunny, with a high near 78. Northwest wind 5 to 15 mph, with gusts as high as 25 mph.

Saturday Night

Mostly clear, with a low around 56. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

Sunday

Sunny, with a high near 75. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

Sunday Night

Mostly clear, with a low around 53. Northwest wind around 5 mph becoming calm.

Monday

Mostly sunny, with a high near 76.

Monday Night

Partly cloudy, with a low around 58.