Portland, CT Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Portland, a community in Middlesex County, Connecticut.

This Afternoon

80°F

Sunny

Sunny. High near 80, with temperatures falling to around 76 in the afternoon. North wind around 8 mph.

7-day forecast for Portland

When	Temp	Forecast	Wind	Precip
This Afternoon	80°F	Sunny	8 mph N	0%
Tonight	51°F	Partly Cloudy	6 mph N	0%
Saturday	69°F	Mostly Sunny	8 mph NE	0%
Saturday Night	52°F	Mostly Cloudy	2 to 7 mph SE	2%
Sunday	66°F	Showers And Thunderstorms	3 to 9 mph SE	88%
Sunday Night	55°F	Showers And Thunderstorms	3 to 10 mph E	88%
Monday	66°F	Chance Rain Showers	8 to 12 mph N	38%
Monday Night	50°F	Slight Chance Rain Showers then Mostly Cloudy	3 to 9 mph NE	21%
Tuesday	63°F	Slight Chance Rain Showers	12 mph NE	20%
Tuesday Night	47°F	Mostly Cloudy	7 to 12 mph NE	6%
Wednesday	63°F	Partly Sunny then Slight Chance Rain Showers	12 to 16 mph NE	15%
Wednesday Night	48°F	Slight Chance Rain Showers	8 to 13 mph NE	23%
Thursday	63°F	Chance Rain Showers	15 mph NE	30%
Thursday Night	49°F	Chance Rain Showers	8 to 13 mph NE	32%

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

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

All Connecticut locations ›

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 Sep 18, 2026.