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Old Gillespie Lake, IL 7-Day Weather Forecast
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Old Gillespie Lake Weather Forecast
Old Gillespie Lake, IL Weather Forecast Date: 538 PM CDT Mon Aug 10 2026
Weather forecast for Old Gillespie Lake, IL
Tonight Lo: 75°F Lo: 24°C |
Tonight... Partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 101 early this evening. |
Tue Hi: 95°FHi: 35°C Lo: 75°F Lo: 24°C |
Tuesday... Sunny with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 108. |
Wed Hi: 91°FHi: 33°C Lo: 71°F Lo: 22°C |
Wednesday... Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 40%. Heat index values up to 102. |
| Thu Hi: 90°FHi: 32°C Lo: 70°F Lo: 21°C |
Thursday... Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs around 90. Chance of rain 40%. Heat index values up to 100. |
| Fri Hi: 89°FHi: 32°C Lo: 71°F Lo: 22°C |
Friday... Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20%. |
| Sat Hi: 91°FHi: 33°C Lo: 71°F Lo: 22°C |
Saturday... Sunny. Highs in the lower 90s. Heat index values up to 105. |
| Sun Hi: 90°FHi: 32°C Lo: 69°F Lo: 21°C |
Sunday... Mostly sunny with a slight chance of showers and thunderstorms. Highs around 90. Chance of rain 20%. |
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