Old Greenwich, CT Weather & Growing Conditions
This Afternoon
72°F
Sunny
Sunny. High near 72, with temperatures falling to around 67 in the afternoon. South wind 5 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Sunny | 5 to 8 mph S | 0% |
| Tonight | 59°F | Partly Cloudy | 2 to 7 mph S | 0% |
| Thursday | 71°F | Mostly Cloudy | 6 to 12 mph S | 13% |
| Thursday Night | 61°F | Rain Showers Likely | 5 to 9 mph S | 69% |
| Friday | 69°F | Rain Showers | 5 mph S | 89% |
| Friday Night | 54°F | Rain Showers Likely | 5 mph NE | 74% |
| Saturday | 65°F | Mostly Sunny then Slight Chance Rain Showers | 6 to 10 mph NW | 16% |
| Saturday Night | 47°F | Slight Chance Light Rain | 10 to 14 mph W | 24% |
| Sunday | 59°F | Slight Chance Light Rain then Mostly Sunny | 13 mph W | 15% |
| Sunday Night | 44°F | Partly Cloudy | 13 mph W | 3% |
| Monday | 58°F | Sunny then Slight Chance Light Rain | 13 to 16 mph W | 15% |
| Monday Night | 43°F | Slight Chance Light Rain then Mostly Clear | 14 mph W | 15% |
| Tuesday | 61°F | Sunny | 15 mph SW | 4% |
| Tuesday Night | 43°F | Mostly Clear | 14 mph W | 1% |
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 Nov 4, 2026.