DeKalb County, IL Weather Forecast
County weather hub
Sunny
Compare major city weather across DeKalb County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 88.
County Weather Overview
This county weather page brings together forecast coverage for DeKalb County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 6 of 6 mapped cities in DeKalb County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 15 to Jul 16, 2026
- Latest sync
- Jul 9, 2026 11:10 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in DeKalb County
Wednesday looks like the warmest upcoming period in DeKalb County at 88 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Wednesday at about 5 to 10 mph W.
The forecast from Jul 15 through Jul 16 stays mostly dry.
Forecast Details
- Last updated
- Jul 9, 2026 11:10 PM CDT
- Coverage
- 2 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 68.
Sunny, with a high near 88.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Jul 15
|
Sunny
|
88°F |
5 to 10 mph
W
|
|
Wednesday Night
Jul 15
|
Mostly Clear
|
68°F |
5 mph
SSW
|
|
Thursday
Jul 16
|
Sunny
|
88°F |
5 to 10 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across DeKalb County.
Coverage
Forecast coverage currently spans 6 of 6 mapped cities in DeKalb County.
Largest mapped city population in this region: 42,621.
