Weather WorldUpper Flat Lake, IL 7-Day Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Upper Flat Lake Weather Forecast
Upper Flat Lake, IL Weather Forecast Date: 612 PM CDT Sat Oct 17 2026
Weather forecast for Upper Flat Lake, IL
Tonight Lo: 35°F Lo: 2°C |
Tonight... Clear. Areas of frost after midnight. Lows in the mid 30s. Southeast winds around 5 mph. |
Sun Hi: 69°FHi: 21°C Lo: 35°F Lo: 2°C |
Sunday... Areas of frost in the morning. Sunny. Not as cool with highs in the upper 60s. South winds 5 to 10 mph. |
| Mon Hi: 71°FHi: 22°C Lo: 39°F Lo: 4°C |
Monday... Sunny. Highs in the lower 70s. South winds around 5 mph. |
| Tue Hi: 75°FHi: 24°C Lo: 41°F Lo: 5°C |
Tuesday... Sunny. Highs in the mid 70s. |
| Wed Hi: 79°FHi: 26°C Lo: 49°F Lo: 9°C |
Wednesday... Mostly clear. Highs in the upper 70s. Lows in the upper 40s. |
| Thu Hi: 79°FHi: 26°C Lo: 49°F Lo: 9°C |
Thursday... Mostly clear. Highs in the upper 70s. Lows in the upper 40s. |
| Fri Hi: 79°FHi: 26°C Lo: 49°F Lo: 9°C |
Friday... Mostly clear. Highs in the upper 70s. Lows in the upper 40s. |
| Fri Hi: 79°FHi: 26°C Lo: 49°F Lo: 9°C |
Friday... Mostly clear. Highs in the upper 70s. Lows in the upper 40s. |
Upper Flat Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...