Northwest Harwinton, CT Weather & Growing Conditions
Overnight
49°F
Partly Cloudy
Partly cloudy, with a low around 49. North wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Partly Cloudy | 5 mph N | 0% |
| Saturday | 66°F | Mostly Sunny | 5 mph NE | 0% |
| Saturday Night | 50°F | Mostly Cloudy | 2 mph SE | 1% |
| Sunday | 61°F | Rain Showers | 1 to 6 mph SE | 94% |
| Sunday Night | 53°F | Rain Showers | 2 to 8 mph E | 94% |
| Monday | 63°F | Chance Rain Showers | 6 to 10 mph NE | 28% |
| Monday Night | 47°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 10 mph NE | 22% |
| Tuesday | 58°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Tuesday Night | 45°F | Mostly Cloudy | 8 to 13 mph NE | 8% |
| Wednesday | 59°F | Partly Sunny then Slight Chance Rain Showers | 10 to 14 mph NE | 15% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 10 to 14 mph NE | 24% |
| Thursday | 58°F | Chance Rain Showers | 10 to 14 mph NE | 30% |
| Thursday Night | 47°F | Chance Rain Showers | 8 to 13 mph NE | 34% |
| Friday | 63°F | Chance Rain Showers | 9 to 13 mph N | 33% |
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 Sep 19, 2026.