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Town of Greenwich, ConnecticutOld Greenwich, CT Weather Forecast
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| THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  | |  |  | | | | | | |
| Partly Sunny | Mostly Cloudy | Showers | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Chance of Showers | Chance of Showers |
| Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 55°FLo: 13°C | Hi: 69°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C | Hi: 65°FHi: 18°C | Lo: 50°FLo: 10°C |
| POP: 100% | POP: 90% | POP: 20% | POP: 30% | POP: 30% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 229 PM EDT Sat Sep 19 2026 
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Issued: 511 PM EDT Sat Sep 19 2026
Key Messages
1) Widespread rain Sunday into Sunday night.
2) Breezy and cool conditions likely mid to late next week, with periods of unsettled weather possible. Potential for minor to moderate coastal flood and shoreline impacts mid to late next week.
Discussion
... .KEY MESSAGE 1...
Frontal system with a weak wave of low pressure for the close of this weekend will eventually settle to the south of the region into early next week. Potential for heavy rain Sunday into Sunday night has significantly l...