Portland, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a community in Middlesex County, Connecticut.
This Afternoon
71°F
Mostly Sunny
Mostly sunny. High near 71, with temperatures falling to around 63 in the afternoon. South wind 5 to 9 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Mostly Sunny | 5 to 9 mph S | 0% |
| Tonight | 47°F | Partly Cloudy | 3 mph S | 0% |
| Wednesday | 75°F | Mostly Sunny | 3 to 9 mph S | 0% |
| Wednesday Night | 52°F | Mostly Cloudy | 6 mph SW | 0% |
| Thursday | 72°F | Chance Rain Showers | 3 to 10 mph S | 25% |
| Thursday Night | 61°F | Chance Rain Showers | 3 to 7 mph SW | 53% |
| Friday | 69°F | Showers And Thunderstorms | 2 to 6 mph S | 78% |
| Friday Night | 54°F | Showers And Thunderstorms then Light Rain | 5 mph NE | 78% |
| Saturday | 65°F | Light Rain Likely | 7 mph N | 68% |
| Saturday Night | 44°F | Chance Light Rain | 5 mph N | 39% |
| Sunday | 61°F | Mostly Sunny | 3 to 7 mph NW | 12% |
| Sunday Night | 40°F | Partly Cloudy then Slight Chance Light Rain | 3 mph NW | 16% |
| Monday | 58°F | Chance Light Rain | 3 to 9 mph NW | 31% |
| Monday Night | 38°F | Chance Light Rain | 5 to 9 mph NW | 31% |
Forecast source: National Weather Service (api.weather.gov) for Portland (41.577, -72.620). Updated through the day.
Growing snapshot for Portland
Last spring frost
Apr 17
First fall frost
Oct 26
Growing season
191 days
Hardiness zone
6b
More local growing data for Portland: nearby ZIP 06480 weather · frost dates · planting calendar · Connecticut frost dates
Nearby towns & communities
Chester Center
Clinton
Deep River Center
Durham
East Hampton
Essex Village
Fenwick
Higganum
Lake Pocotopaug
Middletown
Moodus
Old Saybrook Center
Saybrook Manor
Westbrook Center
Climate data from the nearest NOAA station, Hartford Brainard Fld, Ct (10 mi from Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.