Colchester, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colchester, a community in New London County, Connecticut.
This Afternoon
79°F
Sunny
Sunny. High near 79, with temperatures falling to around 76 in the afternoon. North wind around 7 mph.
7-day forecast for Colchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Sunny | 7 mph N | 0% |
| Tonight | 49°F | Partly Cloudy | 6 mph N | 0% |
| Saturday | 69°F | Mostly Sunny | 8 mph NE | 0% |
| Saturday Night | 51°F | Mostly Cloudy | 2 to 7 mph SE | 1% |
| Sunday | 66°F | Showers And Thunderstorms | 3 to 10 mph SE | 86% |
| Sunday Night | 55°F | Showers And Thunderstorms | 3 to 10 mph SE | 88% |
| Monday | 66°F | Chance Rain Showers | 7 to 12 mph NE | 44% |
| Monday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 22% |
| Tuesday | 62°F | Slight Chance Rain Showers | 13 mph NE | 18% |
| Tuesday Night | 47°F | Mostly Cloudy | 9 to 13 mph NE | 6% |
| Wednesday | 63°F | Partly Sunny | 13 to 16 mph NE | 12% |
| Wednesday Night | 48°F | Slight Chance Rain Showers | 10 to 15 mph NE | 24% |
| Thursday | 62°F | Chance Rain Showers | 13 to 16 mph NE | 29% |
| Thursday Night | 48°F | Chance Rain Showers | 9 to 14 mph NE | 32% |
Forecast source: National Weather Service (api.weather.gov) for Colchester (41.578, -72.333). Updated through the day.
Growing snapshot for Colchester
Last spring frost
Apr 14
First fall frost
Oct 24
Growing season
192 days
Hardiness zone
6b
More local growing data for Colchester: nearby ZIP 06415 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Baltic
Conning Towers-Nautilus Park
Gales Ferry
Groton
Groton Long Point
Jewett City
Long Hill
Mashantucket
Mystic
New London
Niantic
Noank
Norwich
Old Mystic
Oxoboxo River
Pawcatuck
Poquonock Bridge
Stonington
Waterford
Climate data from the nearest NOAA station, Norwich Public Utility Plt, Ct (14.7 mi from Colchester). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.