Weather forecast for: De Kalb IL
Last Update: 9:46 am CDT Sep 4, 2026
Today: Sunny, with a high near 91. Heat index values as high as 103. Southwest wind 5 to 10 mph becoming east in the morning.
Tonight: A 20 percent chance of showers and thunderstorms after midnight. Partly cloudy, with a low around 71. West southwest wind around 5 mph.
Saturday: Sunny, with a high near 86. Northwest wind 5 to 10 mph becoming north northeast in the morning.
Saturday Night: Partly cloudy, with a low around 64. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday: Mostly sunny, with a high near 82. East wind around 5 mph, with gusts as high as 10 mph.
Sunday Night: Partly cloudy, with a low around 61.
Labor Day: Mostly sunny, with a high near 81.
Monday Night: Partly cloudy, with a low around 63.
Tuesday: Partly sunny, with a high near 84.
Tuesday Night: A chance of showers after 1am. Partly cloudy, with a low around 71.
Wednesday: Partly sunny, with a high near 87.
Wednesday Night: A chance of showers. Partly cloudy, with a low around 67.
Thursday: Partly sunny, with a high near 81.
WeatherWorld.com
City of DeKalb, Illinois
