Cos Cob, CT Weather & Growing Conditions
Tonight
50°F
Patchy Fog
Patchy fog after 11pm. Partly cloudy, with a low around 50. Southwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Patchy Fog | 3 mph SW | 3% |
| Wednesday | 72°F | Patchy Fog then Sunny | 3 to 10 mph SW | 3% |
| Wednesday Night | 56°F | Partly Cloudy | 6 mph S | 2% |
| Thursday | 71°F | Chance Rain Showers | 3 to 9 mph S | 43% |
| Thursday Night | 60°F | Rain Showers | 6 mph S | 82% |
| Friday | 68°F | Showers And Thunderstorms | 5 mph S | 84% |
| Friday Night | 53°F | Showers And Thunderstorms | 5 mph W | 84% |
| Saturday | 66°F | Chance Rain Showers | 5 to 8 mph NW | 51% |
| Saturday Night | 42°F | Slight Chance Rain Showers | 7 mph NW | 19% |
| Sunday | 61°F | Slight Chance Rain Showers then Mostly Sunny | 8 mph W | 18% |
| Sunday Night | 39°F | Partly Cloudy | 7 mph W | 14% |
| Monday | 60°F | Slight Chance Light Rain | 8 to 14 mph NW | 24% |
| Monday Night | 38°F | Chance Light Rain | 9 mph W | 27% |
| Tuesday | 61°F | Slight Chance Light Rain then Mostly Sunny | 9 to 14 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cos Cob, CT
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
188 days
Hardiness zone
7a
Explore more for Cos Cob, CT: full frost dates · planting calendar · Connecticut frost dates
Climate data from the nearest NOAA station, Stamford 5 N, Ct (5.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.