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St. Mary High School, IL Weather Forecast
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St. Mary High School Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  |  |  | | | | | |  |  | |
| Chance of T-Storm | Clearing | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Partly Cloudy | Chance of Showers | Mostly Cloudy | Partly Cloudy |
| Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 91°FHi: 33°C | Lo: 79°FLo: 26°C | Hi: 89°FHi: 32°C | Lo: 75°FLo: 24°C | Hi: 89°FHi: 32°C | Lo: 75°FLo: 24°C | Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C |
| POP: 20% | POP: 20% | POP: 40% | POP: 30% | POP: 50% | POP: 20% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 520 AM CDT Tue Sep 01 2026 
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Issued: 627 AM CDT Tue Sep 1 2026
Key Messages
- Today and tomorrow will be hot and humid with peak heat indices of 100 to 110F.
- There is a low (10 to 20%) chance for severe thunderstorms today, mainly from mid morning to early afternoon.
- Chances for thunderstorms increase Thursday and Friday as the hot and humid conditions are pushed south of I-80.
- A break in the humidity may materialize this weekend.
Discussion
... Issued at 152 AM CDT Tue Sep 1 2026
Though Tonight...
Early morning GOES-19 water vapor imagery depicts an expansive sum...