Old Greenwich, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Old Greenwich, a community in Fairfield County, Connecticut.
This Afternoon
81°F
Sunny
Sunny. High near 81, with temperatures falling to around 78 in the afternoon. Northwest wind around 10 mph.
7-day forecast for Old Greenwich
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 81°F | Sunny | 10 mph NW | 0% |
| Tonight | 57°F | Partly Cloudy | 8 to 13 mph N | 0% |
| Saturday | 69°F | Mostly Sunny | 8 to 13 mph E | 0% |
| Saturday Night | 61°F | Mostly Cloudy then Slight Chance Rain Showers | 8 mph SE | 15% |
| Sunday | 69°F | Showers And Thunderstorms | 6 to 13 mph SE | 87% |
| Sunday Night | 60°F | Showers And Thunderstorms | 3 to 13 mph SW | 87% |
| Monday | 68°F | Chance Rain Showers | 10 to 14 mph NE | 45% |
| Monday Night | 57°F | Chance Rain Showers | 10 to 21 mph NE | 27% |
| Tuesday | 63°F | Chance Rain Showers | 16 to 22 mph NE | 26% |
| Tuesday Night | 55°F | Chance Rain Showers then Mostly Cloudy | 18 to 24 mph NE | 26% |
| Wednesday | 63°F | Mostly Cloudy then Slight Chance Rain Showers | 20 to 24 mph NE | 15% |
| Wednesday Night | 55°F | Chance Rain Showers | 21 to 25 mph NE | 33% |
| Thursday | 62°F | Chance Rain Showers | 18 to 24 mph NE | 33% |
| Thursday Night | 55°F | Chance Rain Showers | 21 mph NE | 35% |
Forecast source: National Weather Service (api.weather.gov) for Old Greenwich (41.020, -73.568). Updated through the day.
Growing snapshot for Old Greenwich
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
7b
More local growing data for Old Greenwich: nearby ZIP 06870 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Ball Pond
Bethel
Bigelow Corners
Bogus Hill
Botsford
Branchville
Bridgeport
Brookfield Center
Candlewood Isle
Candlewood Knolls
Candlewood Lake Club
Candlewood Orchards
Candlewood Shores
Cannondale
Chimney Point
Coleytown
Compo
Cos Cob
Danbury
Daniels Farm
Darien Downtown
Dodgingtown
East Village
Fairfield University
Georgetown
Greens Farms
Greenwich
Hawleyville
Indian Field
Inglenook
Climate data from the nearest NOAA station, Stamford 5 N, Ct (7 mi from Old Greenwich). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.