DeKalb County, IL Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across DeKalb County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy, with a low around 52. East southeast wind around 10 mph, with gusts as high as 20 mph.
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
- May 31 to Jun 6, 2026
- Latest sync
- May 31, 2026 2:18 AM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in DeKalb County
Thursday looks like the warmest upcoming period in DeKalb County at 86 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 51 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 15 mph ENE.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- May 31, 2026 2:18 AM CDT
- Coverage
- 7 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
Partly sunny, with a high near 80. East southeast wind 5 to 10 mph, with gusts as high as 25 mph.
Mostly cloudy, with a low around 55. East northeast wind around 5 mph.
Mostly sunny, with a high near 80. East northeast wind 5 to 10 mph.
Mostly clear, with a low around 53. Northeast wind 5 to 10 mph.
Sunny, with a high near 80.
Clear, with a low around 51.
Sunny, with a high near 84.
Mostly clear, with a low around 56.
Mostly sunny, with a high near 86.
A slight chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 62.
A chance of rain showers before 1pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 86.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
A chance of showers and thunderstorms. Partly sunny, with a high near 85.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
May 31
|
Mostly Cloudy
|
52°F |
10 mph
ESE
|
|
Sunday
May 31
|
Partly Sunny
|
80°F |
5 to 10 mph
ESE
|
|
Sunday Night
May 31
|
Mostly Cloudy
|
55°F |
5 mph
ENE
|
|
Monday
Jun 1
|
Mostly Sunny
|
80°F |
5 to 10 mph
ENE
|
|
Monday Night
Jun 1
|
Mostly Clear
|
53°F |
5 to 10 mph
NE
|
|
Tuesday
Jun 2
|
Sunny
|
80°F |
5 to 15 mph
ENE
|
|
Tuesday Night
Jun 2
|
Clear
|
51°F |
0 to 10 mph
E
|
|
Wednesday
Jun 3
|
Sunny
|
84°F |
0 to 5 mph
SE
|
|
Wednesday Night
Jun 3
|
Mostly Clear
|
56°F |
5 mph
S
|
|
Thursday
Jun 4
|
Mostly Sunny
|
86°F |
5 to 15 mph
SSW
|
|
Thursday Night
Jun 4
|
Slight Chance Showers And Thunderstorms
|
62°F |
10 mph
SSW
|
|
Friday
Jun 5
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
86°F |
10 to 15 mph
SW
|
|
Friday Night
Jun 5
|
Chance Showers And Thunderstorms
|
63°F |
10 to 15 mph
SW
|
|
Saturday
Jun 6
|
Chance Showers And Thunderstorms
|
85°F |
10 to 15 mph
WSW
|
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.
