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
69°F
Mostly Cloudy
Mostly cloudy. High near 69, with temperatures falling to around 63 in the afternoon. Southwest wind around 6 mph.
7-day forecast for Colchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Mostly Cloudy | 6 mph SW | 0% |
| Tonight | 50°F | Partly Cloudy then Patchy Fog | 5 mph SW | 3% |
| Wednesday | 72°F | Sunny | 3 to 13 mph SW | 3% |
| Wednesday Night | 55°F | Partly Cloudy | 6 mph SW | 2% |
| Thursday | 71°F | Slight Chance Rain Showers | 5 to 12 mph SW | 20% |
| Thursday Night | 61°F | Rain Showers | 5 to 8 mph SW | 80% |
| Friday | 67°F | Showers And Thunderstorms | 6 mph S | 86% |
| Friday Night | 56°F | Showers And Thunderstorms | 5 mph SW | 86% |
| Saturday | 65°F | Rain Showers Likely | 5 to 8 mph NW | 65% |
| Saturday Night | 42°F | Chance Rain Showers | 6 mph NW | 35% |
| Sunday | 60°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 8 mph W | 21% |
| Sunday Night | 36°F | Partly Cloudy then Slight Chance Light Rain | 6 mph W | 15% |
| Monday | 58°F | Chance Light Rain | 6 to 14 mph NW | 25% |
| Monday Night | 35°F | Chance Light Rain | 9 mph W | 26% |
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 Nov 4, 2026.