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| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  |  |  | | |  |  |  | | | |
| Mostly Cloudy | Clearing | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Chance of Showers | Chance of Showers | Showers | Showers | Showers | Chance of Showers |
| Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 61°FHi: 16°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C Lo: 51°FLo: 11°C | Hi: 61°FHi: 16°C Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C |
| POP: 30% | POP: 50% | POP: 70% | POP: 60% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 402 PM EDT Mon Sep 21 2026 
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Issued: 426 PM EDT Mon Sep 21 2026
Key Messages
- Dry and cool weather through at least Tuesday night. Breezy, especially across Cape Cod and the Islands.
- Monitoring the potential for a strong coastal low to form mid to late week, bringing chances for strong winds, rainfall, and coastal flood/erosion concerns heading into the weekend.
Discussion
... KEY MESSAGE 1...Dry and cool weather through Tuesday night. Breezy, especially across Cape Cod and the Islands.
Anomalous 1030+ mb high pressure over southeast Ontario Monday, builds eastwa...