Weather WorldSullivan Lake, IL 7-Day Weather Forecast
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Sullivan Lake Weather Forecast
Sullivan Lake, IL Weather Forecast Date: 121 AM CDT Mon Oct 12 2026
Weather forecast for Sullivan Lake, IL
Tonight Lo: 60°F Lo: 16°C |
Tonight... Mostly cloudy. Near steady temperature in the lower 60s. Southwest winds 5 to 10 mph. |
Mon Hi: 85°FHi: 29°C Lo: 69°F Lo: 21°C |
Monday... Partly cloudy in the morning, then clearing. Highs in the mid 80s. Southwest winds 10 to 15 mph with gusts up to 25 mph. |
| Tue Hi: 81°FHi: 27°C Lo: 59°F Lo: 15°C |
Tuesday... Partly cloudy in the morning, then becoming mostly sunny. Highs in the lower 80s. West winds 10 to 15 mph, diminishing to 5 to 10 mph in the afternoon. |
Wed Hi: 69°FHi: 21°C Lo: 51°F Lo: 11°C |
Wednesday... Mostly cloudy. A chance of showers, mainly in the morning. Highs in the upper 60s. Chance of precipitation 40%. |
Thu Hi: 65°FHi: 18°C Lo: 45°F Lo: 7°C |
Thursday... Showers likely with a slight chance of thunderstorms. Highs in the mid 60s. Chance of precipitation 70%. |
Fri Hi: 59°FHi: 15°C Lo: 35°F Lo: 2°C |
Friday... Mostly cloudy and windy. Highs in the upper 50s. |
Sat Hi: 55°FHi: 13°C Lo: 39°F Lo: 4°C |
Saturday... Sunny. Highs in the mid 50s. |
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