Cornwall, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cornwall, a community in Litchfield County, Connecticut.
Today
82°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 82. Northwest wind 0 to 3 mph.
7-day forecast for Cornwall
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Patchy Fog then Sunny | 0 to 3 mph NW | 0% |
| Tonight | 60°F | Partly Cloudy | 1 mph NW | 1% |
| Wednesday | 81°F | Partly Sunny | 0 to 3 mph SW | 3% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms | 2 mph S | 27% |
| Thursday | 85°F | Chance Showers And Thunderstorms | 0 to 6 mph SW | 70% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 0 to 3 mph SW | 70% |
| Friday | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 58% |
| Friday Night | 66°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 2 mph W | 58% |
| Saturday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 6 mph W | 49% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 2 mph W | 49% |
| Sunday | 85°F | Mostly Sunny | 0 to 5 mph W | 12% |
| Sunday Night | 66°F | Mostly Clear | 2 mph SW | 12% |
| Monday | 86°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 7 mph W | 24% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms | 1 to 6 mph W | 24% |
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 Aug 4, 2026.