Derby, CT Weather & Growing Conditions
This Afternoon
70°F
Partly Sunny
Partly sunny. High near 70, with temperatures falling to around 63 in the afternoon. Southwest wind 2 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Partly Sunny | 2 to 9 mph SW | 0% |
| Tonight | 49°F | Partly Cloudy | 2 mph S | 0% |
| Wednesday | 72°F | Mostly Sunny | 2 to 9 mph SW | 0% |
| Wednesday Night | 54°F | Mostly Cloudy | 5 mph SW | 0% |
| Thursday | 71°F | Chance Rain Showers | 2 to 10 mph S | 27% |
| Thursday Night | 59°F | Showers And Thunderstorms Likely | 2 to 6 mph SW | 59% |
| Friday | 69°F | Showers And Thunderstorms | 2 to 7 mph S | 77% |
| Friday Night | 53°F | Showers And Thunderstorms then Light Rain Likely | 3 mph W | 77% |
| Saturday | 66°F | Light Rain Likely | 5 to 8 mph N | 61% |
| Saturday Night | 43°F | Chance Light Rain | 6 mph NW | 33% |
| Sunday | 62°F | Mostly Sunny | 5 to 8 mph NW | 14% |
| Sunday Night | 42°F | Partly Cloudy then Slight Chance Light Rain | 2 to 6 mph NW | 18% |
| Monday | 59°F | Chance Light Rain | 6 to 12 mph NW | 31% |
| Monday Night | 39°F | Chance Light Rain | 7 to 13 mph NW | 31% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Derby, CT
Last spring frost
Apr 25
First fall frost
Oct 17
Growing season
175 days
Hardiness zone
6b
Explore more for Derby, CT: full frost dates · planting calendar · Connecticut frost dates
Climate data from the nearest NOAA station, Ansonia 1 Ne, Ct (1.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.