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City of DeKalb, IllinoisDeKalb, IL 7-Day Weather Forecast
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DeKalb Weather Forecast
DeKalb, IL Weather Forecast Date: 120 AM CDT Tue Sep 08 2026
Weather forecast for DeKalb, IL
Tonight Lo: 59°F Lo: 15°C |
Tonight... Partly cloudy. Lows in the upper 50s. Southeast winds around 5 mph. |
Tue Hi: 85°FHi: 29°C Lo: 70°F Lo: 21°C |
Tuesday... Mostly cloudy in the morning, then becoming partly cloudy. Highs in the mid 80s. South winds 5 to 10 mph. |
Wed Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Wednesday... Mostly cloudy. Showers with a slight chance of thunderstorms in the morning, then a slight chance of showers in the afternoon. Humid with highs in the lower 80s. West winds 5 to 10 mph. Chance of precipitation 90%. |
| Thu Hi: 79°FHi: 26°C Lo: 55°F Lo: 13°C |
Thursday... Partly cloudy in the morning, then clearing. Highs in the upper 70s. |
Fri Hi: 80°FHi: 27°C Lo: 61°F Lo: 16°C |
Friday... Sunny. Highs around 80. |
Sat Hi: 81°FHi: 27°C Lo: 60°F Lo: 16°C |
Saturday... Mostly cloudy. A chance of showers in the morning. Highs in the lower 80s. Chance of precipitation 30%. |
| Sun Hi: 80°FHi: 27°C Lo: 61°F Lo: 16°C |
Sunday... Mostly cloudy with a 40% chance of showers. Highs around 80. |
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