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Upper Bay Weather Forecast
| TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY |
 |  | |  |  | | |  | | | | |
| Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of Showers | Chance of Showers | Mostly Sunny | Partly Cloudy | Partly Sunny | Partly Cloudy | Partly Sunny | Partly Cloudy | Partly Sunny |
| Lo: 41°FLo: 5°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C |
| POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 500 PM EDT Fri Sep 18 2026 
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Issued: 719 PM EDT Fri Sep 18 2026
Key Messages
1. High pressure moves in for tonight and Saturday with fair weather. Areas of of frost possible across mountain valleys in the north tonight.
2. Low pressure will bring a period of rain Sunday into Sunday night.
3. High pressure brings mostly fair weather Monday through Wednesday with temperatures running below normal.
Discussion
... KEY MESSAGE 1 DESCRIPTION...
While high pressure will start to settle into the region tonight, the center will be only be near the Ontario/Quebec border by ...