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Stony Brook, MA Weather Forecast
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Stony Brook Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY |
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| Thunderstorms | Thunderstorms | Showers | Showers | Mostly Cloudy | Mostly Cloudy | Mostly Sunny | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Sunny |
| Hi: 61°FHi: 16°C | Lo: 51°FLo: 11°C | Hi: 59°FHi: 15°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 61°FLo: 16°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C |
| POP: 100% | POP: 90% | POP: 90% | POP: 80% |
POP = Probability of Precipitation.
Weather Outlook Updated: 402 AM EDT Sun Sep 27 2026 
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Issued: 342 AM EDT Sun Sep 27 2026
Key Messages
- The worst of the wind is behind us but windswept rain with minor coastal flooding/beach erosion and potential for some localized urban and street flooding persists into Monday.
- Marked improvement Tuesday, followed by mainly dry and warmer weather for the remainder of the week.
Discussion
...
KEY MESSAGE 1...The worst of the wind is behind us but windswept rain with minor coastal flooding/beach erosion and potential for some localized urban and street flooding persists into Monday.
Monito...