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Upper Flat Lake, IL Weather Forecast
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Upper Flat Lake Weather Forecast
| REST OF TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | VETERANS DAY | WEDNESDAY NIGHT | THURSDAY |
 |  | | | | | | |  | |  |  |
| Clear | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Clear | Clear | Partly Cloudy | Mostly Sunny | Chance of Rain | Chance of Rain |
| Lo: 29°FLo: -2°C | Hi: 51°FHi: 11°C | Lo: 31°FLo: -1°C | Hi: 61°FHi: 16°C | Lo: 35°FLo: 2°C | Hi: 65°FHi: 18°C | Hi: 69°FHi: 21°C Lo: 41°FLo: 5°C | Hi: 69°FHi: 21°C Lo: 41°FLo: 5°C | Lo: 40°FLo: 4°C | Hi: 65°FHi: 18°C | Hi: 55°FHi: 13°C Lo: 39°FLo: 4°C | Hi: 55°FHi: 13°C Lo: 39°FLo: 4°C |
| POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1227 AM CST Sat Nov 07 2026 
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Issued: 1020 PM CST Fri Nov 6 2026
Key Messages
- A Freeze Warning remains in effect area-wide tonight into Saturday morning.
- Hazardous weather is not anticipated through next Friday as dry conditions prevail and temperatures gradually warm to start the week.
Aviation
/00Z TAFS THROUGH 06Z SUNDAY/... Issued at 1015 PM CST Fri Nov 6 2026
MVFR stratus continues to slowly push south through the southern half of Missouri. By sunrise, it is expected to be nearly completely out of the area. 04z satellite imagery shows steam fog developing in...