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City of Mascoutah, ILMascoutah, IL Weather Forecast
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Mascoutah Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  | |  |  | | | | |
| Partly Sunny | Chance of T-Storm | Chance of T-Storm | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Sunny | Partly Cloudy | Partly Cloudy |
| Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°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: 79°FHi: 26°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C Lo: 55°FLo: 13°C |
| POP: 70% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 538 AM CDT Sun Sep 20 2026 
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Issued: 320 AM CDT Sun Sep 20 2026
Key Messages
- A cold front begins slowly moving through the region today bringing cooler temperatures the rest of the week.
- Thunderstorms along the front tonight bring the best chance for rain all week.
Aviation
/00Z TAFS THROUGH 06Z MONDAY/... Issued at 1047 PM CDT Sat Sep 19 2026
Area of showers and a few thunderstorms over north central Missouri is expected to move just north of UIN over the next several hours, however still expect the chances for showers will increase at UIN late tonight into Sun...