| National Weather Service Forecast for:
De Kalb IL Issued by: National Weather Service Chicago, IL |
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| Updated: 3:01 am CDT Jun 22, 2026 | ||||||||||||||||||
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| Today |
A 20 percent chance of showers after 4pm. Mostly sunny, with a high near 74. North northeast wind around 10 mph, with gusts as high as 20 mph. |
| Tonight |
A 20 percent chance of showers before 10pm. Mostly clear, with a low around 51. North northeast wind 5 to 10 mph. |
| Tuesday |
Increasing clouds, with a high near 76. North northeast wind around 5 mph becoming calm. |
| Tuesday Night |
Mostly cloudy, with a low around 57. South wind around 5 mph, with gusts as high as 10 mph. |
| Wednesday |
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 78. West southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. |
| Wednesday Night |
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 58. |
| Thursday |
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 77. |
| Thursday Night |
Partly cloudy, with a low around 56. |
| Friday |
Mostly sunny, with a high near 78. |
| Friday Night |
Mostly cloudy, with a low around 58. |
| Saturday |
Partly sunny, with a high near 80. |
| Saturday Night |
A chance of showers. Mostly cloudy, with a low around 64. |
| Sunday |
Mostly sunny, with a high near 86. |
Forecast from NOAA-NWS for De Kalb IL.