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City of Mount Sterling, ILMount Sterling, IL Weather Forecast
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Mount Sterling Weather Forecast
| REST OF TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  | | | | |  |  | |  |  | |
| Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers |
| Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Hi: 85°FHi: 29°C Lo: 61°FLo: 16°C | Hi: 85°FHi: 29°C Lo: 61°FLo: 16°C |
| POP: 20% | POP: 50% | POP: 70% | POP: 50% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 AM CDT Sun Sep 06 2026 
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Issued: 259 AM CDT Sun Sep 6 2026
Key Messages
- Another day of heat index values around 100 F is forecast for central and southeastern MO, but cooler temperatures and lower humidity will arrive elsewhere today, becoming areawide by Monday.
- Heat and near-record breaking temperatures will briefly return Tuesday into Wednesday.
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 bri...