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Lyon School, MO Weather Forecast
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Lyon School Weather Forecast
| THIS AFTERNOON | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
 |  |  |  | | | | | | | |  |
| Chance of T-Storm | Chance of T-Storm | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers |
| Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C |
| POP: 50% | POP: 30% | POP: 40% | POP: 20% | POP: 40% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1148 AM CDT Wed Sep 16 2026 
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Issued: 1214 PM CDT Wed Sep 16 2026
Key Messages
- A late season heat wave continues through at least Friday with peak heat index values of 100-105F+ along/south of I-70.
- Widespread showers and thunderstorms will be limited to northeast MO/west-central IL through this morning with scattered showers and sub-severe thunderstorms possible (20-30%) across the area this afternoon/evening.
Aviation
/18Z TAFS THROUGH 00Z FRIDAY/... Issued at 1211 PM CDT Wed Sep 16 2026
Primary aviation concerns now surround thunderstorm chances this afternoon....