Weather in Dekalb, IL
Updated 2026-09-26 09:00 local time · ZIP codes 60115
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
55°21% rain58°15% rain60°13% rain62°12% rain64°11% rain65°11% rain65°10% rain65°11% rain64°12% rain64°14% rain
59°16% rain57°15% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 21%).
It feels like 51°F with winds near 7 mph.
65°F, 10% rain chance and 5 mph wind.
Visibility is around 6 mi; gusts may reach 12 mph.
Current temperature is 55°F, wind 7 mph, rain chance up to 21%.
UV index is 1.
Local weather characteristics in Dekalb
Illinois has four distinct seasons with hot, humid summers, cold winters, strong frontal changes and frequent spring and summer thunderstorms.
Dekalb is part of the Midwest weather region. The forecast point is near 41.93°N latitude and 88.75°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Dekalb weather today
Overcast and 55°F in Dekalb, IL. Today's high is 65°F with a 12% rain chance. Winds are around 7 mph with gusts near 12 mph. Relative humidity is 75%, pressure is 30.22 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Dekalb
Sunrise is at 06:46 AM and sunset is at 06:45 PM. Tomorrow's forecast calls for Overcast with a high near 68°F and a low near 52°F. The maximum rain chance is 10%.