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Groton Monument Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Chance of Showers | Chance of Showers | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Chance of Showers |
| Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C |
| POP: 50% | POP: 20% | POP: 40% | POP: 80% | POP: 80% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 347 AM EDT Fri Aug 21 2026 
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Groton Monument Forecast Discussion
Issued: 808 AM EDT Fri Aug 21 2026
Key Messages
1) Showers linger east of NYC Metro today.
2) More showers forecast this weekend, marginal flood risk.
3) More of a dry weather pattern taking shape next week but still initially cooler than normal.
Discussion
... .KEY MESSAGE 1... Slight lowering of upper level trough into the region today into tonight.
At the surface, a wave of low pressure moves southeast of Long Island and then eventually moves to the south of Cape Cod by early Saturday.
Still have some cyclonic flow aloft, making for ...