Illinois · NWS LOT office

DeKalb, IL weather

It is 48°F and clear at De Kalb Taylor Municipal Airport as of Oct 28, 3:55 AM CDT. Overnight: Mostly Clear, low near 50°F, 1% chance of precipitation. Forecast from the National Weather Service, issued Oct 28, 3:35 AM CDT.

Updated Oct 28, 4:22 AM CDT (snapshot)

Current conditions

Temperature

48°F

Clear · feels like 45°F

Wind

SSE 7 mph

Humidity 90% · dew point 46°F

Pressure · visibility

30.20 inHg

Visibility 10 mi

Observed at De Kalb Taylor Municipal Airport (KDKB), Oct 28, 3:55 AM CDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the DeKalb forecast zone right now.

Around the NWS LOT forecast area

No active alerts in zones served by the LOT office near DeKalb.

From the alert snapshot of Oct 28, 2026, 5:12 AM EDT. No alerts are active anywhere in Illinois.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for DeKalb (local time)
TimeTempForecastPrecip. chanceWind
Wed 4 AM51°FMostly Clear1%S 5 mph
Wed 5 AM50°FMostly Clear1%S 5 mph
Wed 6 AM50°FSunny0%S 5 mph
Wed 7 AM49°FSunny0%S 5 mph
Wed 8 AM51°FSunny0%S 5 mph
Wed 9 AM55°FSunny0%S 5 mph
Wed 10 AM60°FSunny0%S 10 mph
Wed 11 AM64°FSunny0%S 10 mph
Wed 12 PM67°FSunny0%S 10 mph
Wed 1 PM70°FSunny0%S 10 mph
Wed 2 PM72°FSunny0%S 15 mph
Wed 3 PM73°FSunny0%S 15 mph
Wed 4 PM72°FMostly Sunny0%S 15 mph
Wed 5 PM70°FMostly Sunny0%S 10 mph
Wed 6 PM67°FMostly Clear0%S 10 mph
Wed 7 PM64°FMostly Clear2%S 10 mph
Wed 8 PM63°FMostly Clear2%S 10 mph
Wed 9 PM62°FMostly Clear2%S 10 mph
Wed 10 PM62°FMostly Clear4%S 10 mph
Wed 11 PM61°FMostly Clear3%S 15 mph
Thu 12 AM61°FMostly Clear10%S 15 mph
Thu 1 AM61°FPartly Cloudy12%SSW 15 mph
Thu 2 AM61°FPartly Cloudy9%SSW 15 mph
Thu 3 AM60°FSlight Chance Rain Showers17%SSW 15 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in DeKalb can differ.

7-day forecast

Overnight

Low 50°F

Mostly clear, with a low around 50. South wind around 5 mph.

Wednesday

High 73°F·Low 58°F

Sunny. High near 73, with temperatures falling to around 70 in the afternoon. South wind 5 to 15 mph, with gusts as high as 25 mph.

Wednesday Night: A slight chance of rain showers between 3am and 4am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 58. South southwest wind 10 to 15 mph. Chance of precipitation is 30%.

Thursday

High 69°F·Low 42°F

A chance of rain showers before 8am. Partly sunny, with a high near 69. West wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Thursday Night: Mostly clear, with a low around 42. North wind around 5 mph.

Friday

High 63°F·Low 49°F

A slight chance of rain showers after 1pm. Partly sunny, with a high near 63. Chance of precipitation is 20%.

Friday Night: A chance of rain showers before 1am, then a chance of showers and thunderstorms. Cloudy, with a low around 49.

Saturday

High 62°F·Low 50°F

A chance of showers and thunderstorms. Cloudy, with a high near 62.

Saturday Night: A chance of rain showers. Mostly cloudy, with a low around 50.

Sunday

High 66°F·Low 51°F

A chance of rain showers. Mostly cloudy, with a high near 66.

Sunday Night: A slight chance of rain showers. Mostly cloudy, with a low around 51.

Monday

High 66°F·Low 53°F

A chance of rain showers. Mostly cloudy, with a high near 66.

Monday Night: A chance of rain showers. Mostly cloudy, with a low around 53.

Tuesday

High 66°F

Rain showers likely. Mostly cloudy, with a high near 66.

Nearby cities

Larger cities in the area

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About this forecast

Forecast office
DeKalb is served by the National Weather Service LOT forecast office, forecast zone ILZ011, county zone ILC037.
Location used
The Census Bureau's internal point for DeKalb (41.9282, -88.7476), in DeKalb County. Population: 40,491 (2024 estimate), number 41 of the 121 Illinois cities on this site.
Radar
Nearest NWS radar: KLOT. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/41.9282,-88.7476 (forecast issued Oct 28, 3:35 AM CDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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