Northwest Harwinton, CT Weather & Growing Conditions
Today
81°F
Sunny
Sunny, with a high near 81. West wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Sunny | 3 mph W | 0% |
| Tonight | 60°F | Partly Cloudy | 2 mph W | 1% |
| Wednesday | 80°F | Patchy Fog then Partly Sunny | 0 to 5 mph SW | 9% |
| Wednesday Night | 65°F | Slight Chance Rain Showers | 0 to 3 mph S | 20% |
| Thursday | 84°F | Chance Showers And Thunderstorms | 0 to 7 mph SW | 67% |
| Thursday Night | 68°F | Chance Showers And Thunderstorms then Isolated Showers And Thunderstorms | 5 mph SW | 67% |
| Friday | 85°F | Mostly Sunny then Scattered Showers And Thunderstorms | 2 to 6 mph SW | 50% |
| Friday Night | 67°F | Scattered Showers And Thunderstorms | 3 mph W | 50% |
| Saturday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph W | 40% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 5 mph W | 40% |
| Sunday | 84°F | Mostly Sunny | 2 to 6 mph W | 12% |
| Sunday Night | 67°F | Mostly Clear | 5 mph SW | 12% |
| Monday | 85°F | Sunny then Slight Chance Showers And Thunderstorms | 3 to 9 mph W | 20% |
| Monday Night | 64°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 8 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Northwest Harwinton, CT
Last spring frost
May 8
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a
Explore more for Northwest Harwinton, CT: full frost dates · planting calendar · Connecticut frost dates
Climate data from the nearest NOAA station, Bakersville, Ct (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.