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

De Kalb Taylor Municipal Airport (KDKB)

Lat: 41.93°NLon: 88.71°WElev: 909ft.

Fair

73°F

23°C

Humidity 95%
Wind Speed SE 6 mph
Barometer 29.94 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 16 Jul 12:35 am CDT
Extended Forecast for

Dekalb IL

  • Overnight

    Overnight: A 30 percent chance of showers, mainly before 3am. Mostly cloudy, with a low around 71. Calm wind becoming south around 5 mph.

    Low: 71 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 4pm. Partly sunny, with a high near 89. Heat index values as high as 98. South southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Mostly Sunny
    then T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 66. Southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    T-storms
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 74. North wind around 10 mph, with gusts as high as 15 mph.

    High: 74 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 55. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 55 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 83.

    High: 83 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly before 3am. Mostly cloudy, with a low around 71. Calm wind becoming south around 5 mph.
Wednesday
Showers and thunderstorms likely, mainly after 4pm. Partly sunny, with a high near 89. Heat index values as high as 98. South southwest wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 66. Southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 74. North wind around 10 mph, with gusts as high as 15 mph.
Thursday Night
Mostly cloudy, with a low around 55. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Friday
Mostly sunny, with a high near 78.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62.
Saturday
Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 83.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 82.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 83.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 86.
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ABOUT THIS FORECAST

 
Point Forecast:
Dekalb IL
 41.9°N 88.76°W
Last Update:
12:26 am CDT Jul 16, 2025
Forecast Valid:
12am CDT Jul 16, 2025-6pm CDT Jul 22, 2025
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation