DeKalb, IL Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for DeKalb, IL in one place.
Showers and thunderstorms likely before 4pm, then showers and thunderstorms likely. Cloudy, with a high near 74. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for DeKalb, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 15, 2026 2:47 PM CDT.
The active forecast window currently covers Apr 15 to Apr 21, 2026 for DeKalb, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 15 to Apr 21, 2026
- Latest sync
- Apr 15, 2026 2:47 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in DeKalb
Friday looks like the warmest upcoming period in DeKalb at 79 degrees F.
Sunday Night is the coolest period ahead with temperatures near 32 degrees F.
The strongest winds are forecast for Friday at about 10 to 20 mph SSE.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 2:47 PM 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
Showers and thunderstorms likely before 10pm, then showers and thunderstorms between 10pm and 4am, then a chance of showers and thunderstorms. Cloudy, with a low around 59. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
A chance of showers and thunderstorms before 1pm, then showers and thunderstorms likely. Partly sunny, with a high near 70. West wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms likely before 7pm. Partly cloudy, with a low around 52. Southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.
A slight chance of rain showers between 1pm and 4pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 79. South southeast wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Mostly cloudy, with a low around 48. Chance of precipitation is 90%.
Showers and thunderstorms. Partly sunny, with a high near 61.
A chance of rain showers before 1am. Partly cloudy, with a low around 33.
Mostly sunny, with a high near 51.
Patchy frost after 4am. Partly cloudy, with a low around 32.
Patchy frost before 8am. Sunny, with a high near 61.
Partly cloudy, with a low around 46.
Mostly sunny, with a high near 70.
A slight chance of rain showers after 7pm. Partly cloudy, with a low around 49.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Apr 15
|
Showers And Thunderstorms Likely
|
74°F |
15 mph
SSW
|
|
Tonight
Apr 15
|
Showers And Thunderstorms Likely then Showers And Thunderstorms
|
59°F |
10 to 15 mph
SSW
|
|
Thursday
Apr 16
|
Chance Showers And Thunderstorms
|
70°F |
10 to 15 mph
W
|
|
Thursday Night
Apr 16
|
Showers And Thunderstorms Likely then Partly Cloudy
|
52°F |
5 mph
SE
|
|
Friday
Apr 17
|
Partly Sunny then Slight Chance Showers And Thunderstorms
|
79°F |
10 to 20 mph
SSE
|
|
Friday Night
Apr 17
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms
|
48°F |
15 to 20 mph
SSW
|
|
Saturday
Apr 18
|
Showers And Thunderstorms
|
61°F |
20 mph
WNW
|
|
Saturday Night
Apr 18
|
Chance Rain Showers
|
33°F |
15 to 20 mph
WNW
|
|
Sunday
Apr 19
|
Mostly Sunny
|
51°F |
15 to 20 mph
WNW
|
|
Sunday Night
Apr 19
|
Partly Cloudy then Patchy Frost
|
32°F |
5 to 15 mph
WNW
|
|
Monday
Apr 20
|
Patchy Frost then Sunny
|
61°F |
5 to 15 mph
S
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
46°F |
10 to 15 mph
S
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
70°F |
15 to 20 mph
SW
|
|
Tuesday Night
Apr 21
|
Slight Chance Rain Showers
|
49°F |
10 to 15 mph
WSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around DeKalb.
