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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

De Kalb Taylor Municipal Airport (KDKB)

Lat: 41.93°NLon: 88.71°WElev: 909ft.

Overcast

74°F

23°C

Humidity 66%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 7:55 pm CDT
Extended Forecast for

Dekalb IL

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly clear, with a low around 58. West wind around 5 mph becoming calm.

    Low: 58 °F

    Partly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 82. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 60. South wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 80. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 10pm. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 86.

    High: 86 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 87.

    High: 87 °F

    Partly Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 58. West wind around 5 mph becoming calm.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 82. Calm wind becoming south southwest around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 60. South wind around 5 mph.
Saturday
Increasing clouds, with a high near 80. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 10pm. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 86.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71.
Monday
Partly sunny, with a high near 87.
Monday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
A chance of showers. Mostly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dekalb IL
 41.9°N 88.76°W
Last Update:
2:51 pm CDT Aug 27, 2026
Forecast Valid:
8pm CDT Aug 27, 2026-6pm CDT Sep 3, 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