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City of St. Clair, MOSt. Clair, MO Weather Forecast
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St. Clair Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
 |  |  | | | | |  |  |  |  | |
| Mostly Clear | Sunny | Partly Cloudy | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of T-Storm |
| Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C | Lo: 61°FLo: 16°C |
| POP: 70% | POP: 70% | POP: 20% | POP: 20% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Sun Sep 06 2026 
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Issued: 1231 AM CDT Sun Sep 6 2026
Key Messages
- Cooler (and less humid) air will move into the region for the rest of the holiday weekend before a (brief) return to heat midweek.
Aviation
/06Z TAFS THROUGH 12Z MONDAY/... Issued at 1231 AM CDT Sun Sep 6 2026
A band broken band of MVFR ceilings is expected to approach the Mississippi River through sunrise with confidence increasing in a brief period of impacts at KUIN before lifting and scattering occurs. Otherwise, dry and VFR flight conditions will prevail along with light northeaste...