Portland, CT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a community in Middlesex County, Connecticut.
Today
83°F
Sunny
Sunny, with a high near 83. West wind around 3 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 3 mph W | 0% |
| Tonight | 62°F | Mostly Cloudy | 3 mph SW | 3% |
| Wednesday | 83°F | Partly Sunny | 5 mph W | 7% |
| Wednesday Night | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 5 mph S | 16% |
| Thursday | 87°F | Chance Showers And Thunderstorms | 2 to 8 mph S | 37% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 7 mph S | 32% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph SW | 38% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 36% |
| Saturday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 7 mph W | 39% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 39% |
| Sunday | 87°F | Mostly Sunny | 0 to 6 mph W | 12% |
| Sunday Night | 70°F | Mostly Clear | 1 to 5 mph SW | 12% |
| Monday | 89°F | Sunny then Slight Chance Showers And Thunderstorms | 1 to 9 mph W | 15% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms | 2 to 8 mph W | 15% |
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 Aug 4, 2026.