Colchester, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colchester, a community in New London County, Connecticut.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. West wind around 3 mph.
7-day forecast for Colchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 3 mph W | 0% |
| Tonight | 61°F | Mostly Cloudy | 3 mph SW | 3% |
| Wednesday | 83°F | Partly Sunny | 5 mph W | 6% |
| Wednesday Night | 68°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph S | 18% |
| Thursday | 86°F | Chance Showers And Thunderstorms | 2 to 9 mph SW | 27% |
| Thursday Night | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 8 mph SW | 24% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 8 mph SW | 32% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 1 to 6 mph SW | 30% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph W | 38% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 1 to 5 mph W | 38% |
| Sunday | 87°F | Mostly Sunny | 1 to 7 mph W | 11% |
| Sunday Night | 69°F | Mostly Clear | 5 mph SW | 11% |
| Monday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 2 to 9 mph W | 15% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 to 8 mph W | 15% |
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 Aug 4, 2026.