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St Lawrence County Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY |
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| Sunny | Clear | Mostly Cloudy | Chance of Showers | Showers | Mostly Clear | Clear | Clear | Mostly Sunny | Partly Cloudy | Partly Cloudy | Chance of Showers |
| Hi: 59°FHi: 15°C | Lo: 40°FLo: 4°C | Hi: 65°FHi: 18°C | Lo: 49°FLo: 9°C | Hi: 55°FHi: 13°C | Lo: 35°FLo: 2°C | Hi: 51°FHi: 11°C Lo: 35°FLo: 2°C | Hi: 51°FHi: 11°C Lo: 35°FLo: 2°C | Hi: 61°FHi: 16°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C Lo: 45°FLo: 7°C | Hi: 60°FHi: 16°C |
| POP: 50% | POP: 80% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 611 AM EDT Sat Oct 03 2026 
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Instant definitions for any meteorological term.
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Issued: 637 AM EDT Sat Oct 3 2026
Key Messages
As of 222 AM EDT Saturday...
1. Generally cool weather is expected over the next several days. Sunday will be briefly warmer, but a front will cross on Monday bringing gusty winds, showers, and a return to the cooler weather.
2. Cold air mid week will moderate by the late week with a pattern change for the weekend.
Discussion
... As of 222 AM EDT Saturday...
KEY MESSAGE 1: A broad 1028mb surface high will be positioned to our west over the Great Lakes region today. This will keep northerl...