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.

Overnight

52°F

Mostly Cloudy

Mostly cloudy, with a low around 52. Northeast wind around 12 mph.

7-day forecast for Old Mystic

When	Temp	Forecast	Wind	Precip
Overnight	52°F	Mostly Cloudy	12 mph NE	0%
Saturday	68°F	Mostly Sunny	12 mph E	0%
Saturday Night	53°F	Mostly Cloudy	6 to 9 mph SE	0%
Sunday	67°F	Showers And Thunderstorms	6 to 12 mph SE	80%
Sunday Night	57°F	Showers And Thunderstorms	5 to 10 mph E	90%
Monday	66°F	Rain Showers Likely	9 to 13 mph NE	60%
Monday Night	51°F	Slight Chance Rain Showers	6 to 12 mph NE	23%
Tuesday	63°F	Slight Chance Rain Showers	14 mph NE	20%
Tuesday Night	50°F	Mostly Cloudy	9 to 14 mph NE	10%
Wednesday	64°F	Partly Sunny then Slight Chance Rain Showers	14 to 17 mph NE	15%
Wednesday Night	50°F	Chance Rain Showers	10 to 15 mph NE	26%
Thursday	63°F	Chance Rain Showers	17 mph NE	32%
Thursday Night	50°F	Chance Rain Showers	9 to 14 mph NE	37%
Friday	66°F	Chance Rain Showers	10 to 14 mph N	35%

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

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

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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 Sep 19, 2026.