Old Greenwich, CT Weather & Growing Conditions
This Afternoon
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Mostly Sunny | 3 mph SE | 0% |
| Tonight | 67°F | Mostly Cloudy | 5 mph SE | 3% |
| Wednesday | 84°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 to 6 mph E | 23% |
| Wednesday Night | 72°F | Chance Rain Showers | 6 mph S | 26% |
| Thursday | 89°F | Chance Showers And Thunderstorms | 3 to 9 mph SW | 39% |
| Thursday Night | 74°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 to 8 mph SW | 38% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 7 mph SW | 39% |
| Friday Night | 73°F | Chance Showers And Thunderstorms | 7 mph SW | 38% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 9 mph SW | 30% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms | 8 mph SW | 30% |
| Sunday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 7 mph W | 15% |
| Sunday Night | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 7 mph SW | 15% |
| Monday | 87°F | Sunny | 5 to 12 mph W | 13% |
| Monday Night | 72°F | Slight Chance Rain Showers | 7 to 12 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Old Greenwich, CT
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
7b
Explore more for Old Greenwich, CT: full frost dates · planting calendar · Connecticut frost dates
Climate data from the nearest NOAA station, Stamford 5 N, Ct (7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.