| National Weather Service Forecast for:
De Kalb IL Issued by: National Weather Service Chicago, IL |
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| Updated: 1:55 am CDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
Patchy fog. Otherwise, partly cloudy, with a low around 58. North northeast wind around 5 mph. |
| Thursday |
Patchy fog before 8am. Otherwise, sunny, with a high near 80. Northeast wind around 5 mph becoming calm in the afternoon. |
| Thursday Night |
Partly cloudy, with a low around 59. Calm wind becoming east southeast around 5 mph. |
| Friday |
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Mostly cloudy, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. |
| Friday Night |
Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 62. Southwest wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 60%. |
| Saturday |
Sunny, with a high near 77. |
| Saturday Night |
Mostly clear, with a low around 57. |
| Sunday |
Sunny, with a high near 75. |
| Sunday Night |
Partly cloudy, with a low around 56. |
| Monday |
Mostly sunny, with a high near 76. |
| Monday Night |
Partly cloudy, with a low around 58. |
| Tuesday |
Mostly sunny, with a high near 78. |
| Tuesday Night |
Partly cloudy, with a low around 62. |
| Wednesday |
Mostly sunny, with a high near 80. |
Forecast from NOAA-NWS for De Kalb IL.
