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St. Stephens School, IL Weather Forecast
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| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  | |  |  | | |  |  | | | |
| Chance of Showers | Cloudy | Chance of Showers | Partly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy |
| Hi: 61°FHi: 16°C | Lo: 55°FLo: 13°C | Hi: 61°FHi: 16°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C |
| POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 141 PM CDT Mon Sep 21 2026 
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Issued: 155 PM CDT Mon Sep 21 2026
Key Messages
- Below average temperatures expected for the remainder of the work week.
Discussion
... Issued at 155 PM CDT Mon Sep 21 2026
A strong (1031 MB) high over Lake Superior is helping produce rather brisk northeast winds which have been ushering in cooler temperatures and gradually lower dewpoints. A closed mid-upper level low seen on water vapor imagery is moving into western IA early this afternoon. This upper low is expected to slowly weaken as it pushes east into northern IL by midday Tue...