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| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | MONDAY |
 | |  |  |  |  | |  |  |  | |
| Drizzle | Drizzle | Mostly Cloudy | Mostly Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C Lo: 59°FLo: 15°C |
| POP: 20% | POP: 20% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 458 PM CDT Mon Sep 21 2026 
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Issued: 641 PM CDT Mon Sep 21 2026
Key Messages
- Scattered showers and an isolated sub-severe thunderstorm are possible (20-30%) across southern MO/IL this afternoon and evening.
- Cool conditions are expected this week with a gradual warmup to near normal temperatures by the weekend.
Aviation
/00Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 632 PM CDT Mon Sep 21 2026
Mainly MVFR ceilings are expected to perist through the period. The only exceptions will be IFR ceilings that are expected late tonight into Tuesday morning (07-14Z) at COU/J...