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Greenwich, CT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Greenwich, a community in Fairfield County, Connecticut.

Today
69°F
Partly Sunny
Partly sunny, with a high near 69. East wind around 9 mph.

7-day forecast for Greenwich

WhenTempForecastWindPrecip
Today 69°F Partly Sunny 9 mph E 0%
Tonight 58°F Mostly Cloudy 7 mph SE 3%
Sunday 69°F Rain 6 to 9 mph SE 92%
Sunday Night 56°F Rain 6 to 12 mph SE 92%
Monday 67°F Chance Light Rain then Partly Sunny 8 to 12 mph NE 30%
Monday Night 52°F Mostly Cloudy then Slight Chance Rain Showers 8 to 12 mph NE 20%
Tuesday 63°F Chance Rain Showers 14 mph NE 25%
Tuesday Night 51°F Slight Chance Rain Showers then Mostly Cloudy 13 to 17 mph NE 23%
Wednesday 64°F Slight Chance Rain Showers 20 mph NE 19%
Wednesday Night 51°F Chance Rain Showers 20 mph NE 31%
Thursday 63°F Chance Rain Showers 21 mph NE 32%
Thursday Night 51°F Chance Rain Showers 16 to 21 mph NE 38%
Friday 65°F Chance Rain Showers 15 to 18 mph N 38%
Friday Night 52°F Chance Rain Showers 18 mph N 33%

Forecast source: National Weather Service (api.weather.gov) for Greenwich (41.028, -73.627). Updated through the day.

Growing snapshot for Greenwich

Last spring frost
Apr 12
First fall frost
Oct 31
Growing season
200 days
Hardiness zone
7a

More local growing data for Greenwich: nearby ZIP 06830 weather · frost dates · planting calendar · Connecticut frost dates

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Climate data from the nearest NOAA station, Westchester Co Ap, Ny (4.8 mi from Greenwich). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.