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Cornell University Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
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| Chance of T-Storm | Thunderstorms | Chance of Showers | Showers | Chance of Showers | Mostly Clear | Mostly Sunny | Mostly Clear | Chance of T-Storm | Chance of Showers | Showers | Partly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 81°FHi: 27°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C |
| POP: 60% | POP: 40% | POP: 70% | POP: 70% | POP: 50% | POP: 60% | POP: 50% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 335 AM EDT Sun Aug 23 2026 
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Cornell University Forecast Discussion
Issued: 212 AM EDT Sun Aug 23 2026
Key Messages
1) A broad upper level low moving over the region is expected produce scattered showers and isolated thunderstorms early this week before moving away from the area Tuesday.
2) High pressure builds in for a brief lull in wet weather Wednesday, then additional showers and thunderstorms are expected to return Thursday into Friday.
Discussion
... KEY MESSAGE 1...
A broad surface low centered near Georgian Bay early this morning will be gradually lifting northward toward the Ontario/Quebec bo...