Stonington, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stonington, a borough in New London County, Connecticut.
Today
68°F
Mostly Sunny
Mostly sunny, with a high near 68. East wind around 9 mph.
7-day forecast for Stonington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Mostly Sunny | 9 mph E | 0% |
| Tonight | 51°F | Partly Cloudy | 3 to 7 mph E | 0% |
| Sunday | 67°F | Rain | 5 to 9 mph SE | 89% |
| Sunday Night | 54°F | Rain | 6 to 9 mph E | 89% |
| Monday | 66°F | Chance Light Rain | 9 to 13 mph NE | 42% |
| Monday Night | 50°F | Mostly Cloudy | 6 to 10 mph NE | 6% |
| Tuesday | 63°F | Mostly Cloudy | 10 to 15 mph NE | 8% |
| Tuesday Night | 51°F | Mostly Cloudy | 13 to 17 mph NE | 6% |
| Wednesday | 64°F | Partly Sunny | 18 to 22 mph NE | 5% |
| Wednesday Night | 51°F | Chance Rain Showers | 18 to 22 mph NE | 27% |
| Thursday | 63°F | Chance Rain Showers | 24 mph NE | 34% |
| Thursday Night | 51°F | Chance Rain Showers | 18 to 22 mph NE | 38% |
| Friday | 64°F | Chance Rain Showers | 23 mph N | 34% |
| Friday Night | 51°F | Chance Rain Showers | 18 to 22 mph N | 35% |
Forecast source: National Weather Service (api.weather.gov) for Stonington (41.335, -71.899). Updated through the day.
Growing snapshot for Stonington
Last spring frost
Apr 11
First fall frost
Oct 31
Growing season
201 days
Hardiness zone
7a
More local growing data for Stonington: nearby ZIP 06378 weather · frost dates · planting calendar · Connecticut frost dates
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Climate data from the nearest NOAA station, Westerly State Ap, Ri (6.1 mi from Stonington). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.