Weather WorldFlat Lake, IL 7-Day Weather Forecast
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Flat Lake Weather Forecast
Flat Lake, IL Weather Forecast Date: 943 PM CDT Tue Sep 29 2026
Weather forecast for Flat Lake, IL
Tonight Lo: 65°F Lo: 18°C |
Tonight... Mostly cloudy. Not as cool with lows in the mid 60s. Southeast winds 5 to 10 mph. |
Wed Hi: 85°FHi: 29°C Lo: 70°F Lo: 21°C |
Wednesday... Mostly cloudy in the morning, then becoming partly sunny. Highs in the mid 80s. South winds 5 to 10 mph. |
Thu Hi: 85°FHi: 29°C Lo: 65°F Lo: 18°C |
Thursday... Mostly cloudy with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Southwest winds 5 to 10 mph. Chance of rain 50%. |
Fri Hi: 71°FHi: 22°C Lo: 51°F Lo: 11°C |
Friday... Mostly cloudy with a chance of showers in the morning, then partly sunny with a slight chance of showers in the afternoon. Cooler with highs in the lower 70s. Chance of rain 50%. |
Sat Hi: 69°FHi: 21°C Lo: 51°F Lo: 11°C |
Saturday... Partly cloudy. A 20% chance of showers. Highs in the upper 60s. Lows in the lower 50s. |
Sun Hi: 69°FHi: 21°C Lo: 49°F Lo: 9°C |
Sunday... Mostly clear. Highs in the upper 60s. Lows in the upper 40s. |
| Mon Hi: 69°FHi: 21°C Lo: 49°F Lo: 9°C |
Monday... Mostly clear. Highs in the upper 60s. Lows in the upper 40s. |
| Tue Hi: 69°FHi: 21°C Lo: 49°F Lo: 9°C |
Tuesday... Mostly clear. Highs in the upper 60s. Lows in the upper 40s. |
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