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Cook School Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  | | |  | | | | |
| Chance of T-Storm | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 55°FLo: 13°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 69°FHi: 21°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C |
| POP: 70% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 353 PM EDT Sat Sep 19 2026 
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Issued: 352 PM EDT Sat Sep 19 2026
Key Messages
- Periods of rain return tonight though Sunday morning with locally heavier rainfall possible at times, and a few thunderstorms.
- Fog settles in overnight, becoming locally dense at times.
- Lingering showers exit by midday Sunday, followed by a cool and cloudy pattern into the middle of the week.
- Areas of showers are possible again late Tuesday into Wednesday.
Discussion
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Modest mid/upper level westerlies reside over the northern Great Lakes and Ontario this afternoon while lower column ...