Stonington, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stonington, a borough in New London County, Connecticut.
Today
80°F
Mostly Sunny
Mostly sunny, with a high near 80. West wind 2 to 6 mph.
7-day forecast for Stonington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Mostly Sunny | 2 to 6 mph W | 0% |
| Tonight | 62°F | Mostly Cloudy | 5 mph N | 14% |
| Wednesday | 80°F | Mostly Sunny | 2 to 7 mph W | 11% |
| Wednesday Night | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph SW | 16% |
| Thursday | 83°F | Mostly Sunny | 3 to 10 mph SW | 11% |
| Thursday Night | 72°F | Partly Cloudy | 5 to 8 mph SW | 11% |
| Friday | 84°F | Sunny | 5 to 10 mph SW | 8% |
| Friday Night | 71°F | Slight Chance Showers And Thunderstorms | 3 to 8 mph SW | 18% |
| Saturday | 81°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 9 mph SW | 17% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms | 3 to 7 mph SW | 21% |
| Sunday | 81°F | Mostly Sunny | 3 to 9 mph SW | 11% |
| Sunday Night | 71°F | Mostly Clear | 3 to 8 mph SW | 7% |
| Monday | 82°F | Sunny | 3 to 12 mph SW | 9% |
| Monday Night | 69°F | Mostly Clear | 5 to 9 mph W | 11% |
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
Nearby towns & communities
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Mashantucket
Mystic
New London
Niantic
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Oxoboxo River
Pawcatuck
Poquonock Bridge
Waterford
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 Aug 4, 2026.