Northwest Harwinton, CT Weather & Growing Conditions
Tonight
54°F
Partly Cloudy
Partly cloudy, with a low around 54. Southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Partly Cloudy | 6 mph SW | 1% |
| Thursday | 67°F | Rain Showers Likely | 6 to 10 mph S | 66% |
| Thursday Night | 58°F | Rain Showers Likely | 1 to 7 mph SW | 60% |
| Friday | 68°F | Chance Rain Showers | 0 to 3 mph SW | 46% |
| Friday Night | 50°F | Chance Light Rain | 1 mph NW | 46% |
| Saturday | 62°F | Partly Sunny then Chance Light Rain | 5 mph NW | 29% |
| Saturday Night | 42°F | Chance Light Rain | 6 to 13 mph NW | 33% |
| Sunday | 55°F | Chance Light Rain then Partly Sunny | 8 to 13 mph NW | 33% |
| Sunday Night | 38°F | Partly Cloudy | 6 to 10 mph W | 2% |
| Monday | 53°F | Sunny | 9 to 14 mph W | 10% |
| Monday Night | 35°F | Mostly Clear | 5 to 8 mph W | 3% |
| Tuesday | 58°F | Sunny | 7 to 12 mph W | 1% |
| Tuesday Night | 35°F | Mostly Clear | 3 to 7 mph W | 1% |
| Veterans Day | 54°F | Sunny | 5 to 9 mph NW | 3% |
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 Nov 5, 2026.