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City of Lanark, ILLanark, IL 7-Day Weather Forecast
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Lanark Weather Forecast
Lanark, IL Weather Forecast Date: 541 PM CDT Mon Oct 26 2026
Weather forecast for Lanark, IL
Tonight Lo: 45°F Lo: 7°C |
Tonight... Mostly cloudy. Patchy fog after midnight. Lows in the mid 40s. East winds 10 to 15 mph. |
Tue Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Tuesday... Partly sunny in the morning, then becoming mostly cloudy. Highs in the lower 70s. Southeast winds 5 to 10 mph. |
Wed Hi: 75°FHi: 24°C Lo: 55°F Lo: 13°C |
Wednesday... Mostly sunny. Highs in the mid 70s. South winds 5 to 10 mph. |
Thu Hi: 71°FHi: 22°C Lo: 49°F Lo: 9°C |
Thursday... Partly sunny. A chance of showers in the morning. Highs in the lower 70s. Chance of rain 50%. |
| Fri Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Friday... Partly sunny with a 50% chance of showers. Highs in the lower 70s. |
| Sat Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Saturday... Mostly cloudy with a 40% chance of showers. Highs in the lower 70s. Lows in the lower 50s. |
| Sun Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Sunday... Mostly cloudy with a 40% chance of showers. Highs in the lower 70s. Lows in the lower 50s. |
| Sun Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Sunday... Mostly cloudy with a 40% chance of showers. Highs in the lower 70s. Lows in the lower 50s. |
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