Cornwall, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cornwall, a community in Litchfield County, Connecticut.
Today
68°F
Mostly Sunny
Mostly sunny, with a high near 68. Southeast wind around 3 mph.
7-day forecast for Cornwall
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Mostly Sunny | 3 mph SE | 0% |
| Tonight | 48°F | Mostly Cloudy | 2 mph SE | 6% |
| Sunday | 60°F | Rain | 2 to 6 mph SE | 98% |
| Sunday Night | 48°F | Rain then Rain Showers Likely | 1 to 7 mph NE | 90% |
| Monday | 66°F | Partly Sunny | 7 mph N | 4% |
| Monday Night | 44°F | Mostly Cloudy | 5 mph NE | 3% |
| Tuesday | 61°F | Mostly Cloudy | 6 mph NE | 5% |
| Tuesday Night | 43°F | Mostly Cloudy | 3 to 9 mph NE | 5% |
| Wednesday | 63°F | Partly Sunny | 10 mph NE | 4% |
| Wednesday Night | 43°F | Mostly Cloudy then Slight Chance Rain Showers | 7 to 12 mph NE | 24% |
| Thursday | 61°F | Chance Rain Showers | 8 to 13 mph NE | 31% |
| Thursday Night | 44°F | Chance Rain Showers | 7 to 12 mph NE | 37% |
| Friday | 63°F | Chance Rain Showers | 8 to 12 mph N | 35% |
| Friday Night | 45°F | Chance Rain Showers | 7 to 13 mph N | 33% |
Forecast source: National Weather Service (api.weather.gov) for Cornwall (41.844, -73.333). Updated through the day.
Growing snapshot for Cornwall
Last spring frost
May 11
First fall frost
Oct 4
Growing season
146 days
Hardiness zone
6a
More local growing data for Cornwall: nearby ZIP 06753 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Bantam
Bethlehem Village
Bridgewater
Canaan
Cornwall Bridge
Falls Village
Gaylordsville
Lakeville
Litchfield
New Hartford Center
New Milford
New Preston
Norfolk
Northwest Harwinton
Oakville
Pleasant Valley
Sharon
Terryville
Thomaston
Torrington
Watertown
West Cornwall
Winsted
Woodbury Center
Climate data from the nearest NOAA station, Falls Village, Ct (8.7 mi from Cornwall). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.