Old Mystic, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Old Mystic, a community in New London County, Connecticut.
Today
81°F
Mostly Sunny
Mostly sunny, with a high near 81. Southwest wind around 6 mph.
7-day forecast for Old Mystic
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Mostly Sunny | 6 mph SW | 0% |
| Tonight | 61°F | Mostly Cloudy | 5 mph NW | 11% |
| Wednesday | 81°F | Mostly Sunny | 2 to 6 mph W | 8% |
| Wednesday Night | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph S | 17% |
| Thursday | 84°F | Mostly Sunny | 3 to 9 mph SW | 13% |
| Thursday Night | 73°F | Partly Cloudy | 3 to 8 mph SW | 12% |
| Friday | 86°F | Sunny | 5 to 9 mph SW | 11% |
| Friday Night | 72°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph SW | 19% |
| Saturday | 85°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 8 mph SW | 21% |
| Saturday Night | 71°F | Slight Chance Showers And Thunderstorms | 2 to 6 mph SW | 21% |
| Sunday | 85°F | Mostly Sunny | 2 to 8 mph W | 11% |
| Sunday Night | 71°F | Mostly Clear | 2 to 7 mph SW | 7% |
| Monday | 87°F | Sunny | 2 to 10 mph SW | 10% |
| Monday Night | 69°F | Mostly Clear | 3 to 8 mph W | 11% |
Forecast source: National Weather Service (api.weather.gov) for Old Mystic (41.384, -71.986). Updated through the day.
Growing snapshot for Old Mystic
Last spring frost
Apr 8
First fall frost
Nov 2
Growing season
207 days
Hardiness zone
7a
More local growing data for Old Mystic: nearby ZIP 06355 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Baltic
Colchester
Conning Towers-Nautilus Park
Gales Ferry
Groton
Groton Long Point
Jewett City
Long Hill
Mashantucket
Mystic
New London
Niantic
Noank
Norwich
Oxoboxo River
Pawcatuck
Poquonock Bridge
Stonington
Waterford
Climate data from the nearest NOAA station, Groton, Ct (3.6 mi from Old Mystic). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.