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City of Sullivan, IllinoisSullivan, IL 7-Day Weather Forecast
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Sullivan Weather Forecast
Sullivan, IL Weather Forecast Date: 507 PM CDT Sat Sep 19 2026
Weather forecast for Sullivan, IL
Tonight Lo: 69°F Lo: 21°C |
Tonight... Mostly cloudy this evening, then becoming partly cloudy. Lows in the upper 60s. South winds around 5 mph. |
Sun Hi: 89°FHi: 32°C Lo: 60°F Lo: 16°C |
Sunday... Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. North winds 5 to 10 mph. Chance of rain 30%. |
Mon Hi: 71°FHi: 22°C Lo: 55°F Lo: 13°C |
Monday... Showers likely, mainly in the morning. Much cooler with highs in the lower 70s. Northeast winds 10 to 15 mph. Chance of rain 70%. |
Tue Hi: 69°FHi: 21°C Lo: 51°F Lo: 11°C |
Tuesday... Mostly cloudy. Highs in the upper 60s. Lows in the lower 50s. |
| Wed Hi: 69°FHi: 21°C Lo: 51°F Lo: 11°C |
Wednesday... Mostly cloudy. Highs in the upper 60s. Lows in the lower 50s. |
| Wed Hi: 69°FHi: 21°C Lo: 51°F Lo: 11°C |
Wednesday... Mostly cloudy. Highs in the upper 60s. Lows in the lower 50s. |
| Thu Hi: 75°FHi: 24°C Lo: 55°F Lo: 13°C |
Thursday... Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s. |
| Fri Hi: 75°FHi: 24°C Lo: 55°F Lo: 13°C |
Friday... Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s. |
| Fri Hi: 75°FHi: 24°C Lo: 55°F Lo: 13°C |
Friday... Mostly cloudy. Highs in the mid 70s. Lows in the mid 50s. |
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