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Posey, IL Weather Forecast
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Posey Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  | |  | | | | | |  |  |  |
| Mostly Clear | Thunderstorms | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Clearing |
| Lo: 75°FLo: 24°C | Hi: 100°FHi: 38°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C Lo: 65°FLo: 18°C | Hi: 91°FHi: 33°C Lo: 65°FLo: 18°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C |
| POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 637 PM CDT Fri Sep 04 2026 
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Issued: 646 PM CDT Fri Sep 4 2026
Key Messages
- Late summer heat will continue on Saturday before temperatures cool on Sunday and Labor Day. The relative humidity will also be much lower on Labor Day compared to earlier in the holiday weekend.
- Another period of heat and near-record breaking temperatures is forecast Tuesday into Wednesday.
Aviation
/00Z TAFS THROUGH 06Z SUNDAY/... Issued at 643 PM CDT Fri Sep 4 2026
VFR conditions are expected to prevail throughout the period. There is a low probability chance for showers or weak thun...