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Williamstown Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
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| Sunny | Partly Cloudy | Partly Cloudy | Chance of T-Storm | Showers Likely | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Partly Cloudy | Chance of Showers | Showers |
| Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C |
| POP: 70% | POP: 70% | POP: 50% | POP: 60% | POP: 60% | POP: 30% | POP: 50% | POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 403 AM EDT Mon Sep 14 2026 
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Issued: 746 AM EDT Mon Sep 14 2026
Key Messages
1) Dry and cooler today as Canadian high pressure quickly moves east across the Great Lakes region.
2) Chances for showers and return Tuesday and continue through Thursday.
Discussion
... KEY MESSAGE 1... A taste of fall expected today as Canadian high pressure quickly pushes eastward across the region. Dry conditions persist through the day today. High temperatures will struggle to reach 70 degrees across much of the forecast area with low 70s most likely across the I-75 corridor. Chil...