Weather World
Old Gillespie Lake, IL 7-Day Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Old Gillespie Lake Weather Forecast
Old Gillespie Lake, IL Weather Forecast Date: 543 PM CDT Sun Aug 09 2026
Weather forecast for Old Gillespie Lake, IL
Tonight Lo: 75°F Lo: 24°C |
Tonight... Mostly clear this evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds 10 to 15 mph. Chance of rain 20%. Heat index values up to 103 early this evening. |
Mon Hi: 91°FHi: 33°C Lo: 75°F Lo: 24°C |
Monday... Mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 20%. Heat index values up to 107 in the afternoon. |
Tue Hi: 91°FHi: 33°C Lo: 75°F Lo: 24°C |
Tuesday... Mostly sunny. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Heat index values up to 106. |
| Wed Hi: 91°FHi: 33°C Lo: 71°F Lo: 22°C |
Wednesday... Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the lower 90s. Chance of rain 40%. Heat index values up to 105. |
| Thu Hi: 85°FHi: 29°C Lo: 69°F Lo: 21°C |
Thursday... Becoming mostly cloudy in the afternoon. A chance of thunderstorms. Showers likely, mainly in the morning. Highs in the mid 80s. Chance of rain 60%. |
| Fri Hi: 81°FHi: 27°C Lo: 69°F Lo: 21°C |
Friday... Mostly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the lower 80s. Chance of rain 50%. |
| Sat Hi: 85°FHi: 29°C Lo: 69°F Lo: 21°C |
Saturday... Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the mid 80s. Chance of rain 50%. |
Old Gillespie Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...