Portland, CT Weather & Growing Conditions
This Afternoon
70°F
Mostly Cloudy
Mostly cloudy. High near 70, with temperatures falling to around 65 in the afternoon. South wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Mostly Cloudy | 7 mph S | 0% |
| Tonight | 51°F | Patchy Fog | 6 mph S | 3% |
| Wednesday | 74°F | Sunny | 3 to 13 mph SW | 3% |
| Wednesday Night | 57°F | Partly Cloudy | 7 mph S | 2% |
| Thursday | 71°F | Chance Rain Showers | 5 to 13 mph S | 27% |
| Thursday Night | 62°F | Rain Showers | 5 to 9 mph S | 79% |
| Friday | 68°F | Showers And Thunderstorms | 6 mph S | 85% |
| Friday Night | 56°F | Showers And Thunderstorms then Light Rain | 6 mph W | 85% |
| Saturday | 65°F | Light Rain Likely | 8 mph NW | 60% |
| Saturday Night | 42°F | Chance Light Rain | 6 mph NW | 27% |
| Sunday | 60°F | Slight Chance Light Rain then Mostly Sunny | 6 to 9 mph W | 20% |
| Sunday Night | 37°F | Partly Cloudy then Slight Chance Light Rain | 6 mph W | 15% |
| Monday | 58°F | Chance Light Rain | 6 to 14 mph W | 26% |
| Monday Night | 36°F | Chance Light Rain | 6 to 9 mph W | 26% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portland, CT
Last spring frost
Apr 17
First fall frost
Oct 26
Growing season
191 days
Hardiness zone
6b
Explore more for Portland, CT: full frost dates · planting calendar · Connecticut frost dates
Climate data from the nearest NOAA station, Hartford Brainard Fld, Ct (10 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.