Portland, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Cumberland County, Maine.
Today
64°F
Mostly Sunny
Mostly sunny, with a high near 64. Southwest wind 5 to 15 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Mostly Sunny | 5 to 15 mph SW | 4% |
| Tonight | 55°F | Partly Cloudy | 10 mph SW | 2% |
| Thursday | 62°F | Mostly Cloudy then Chance Light Rain | 10 to 15 mph S | 43% |
| Thursday Night | 57°F | Slight Chance Light Rain | 10 to 15 mph SW | 20% |
| Friday | 62°F | Light Rain Likely | 5 mph S | 69% |
| Friday Night | 54°F | Light Rain | 5 to 10 mph SE | 93% |
| Saturday | 57°F | Light Rain | 10 mph E | 82% |
| Saturday Night | 48°F | Chance Light Rain | 10 mph N | 40% |
| Sunday | 55°F | Chance Light Rain | 10 mph NW | 35% |
| Sunday Night | 44°F | Partly Cloudy | 5 to 10 mph W | 14% |
| Monday | 52°F | Slight Chance Light Rain | 10 to 15 mph W | 22% |
| Monday Night | 41°F | Slight Chance Light Rain then Partly Cloudy | 10 mph W | 20% |
| Tuesday | 54°F | Mostly Sunny | 10 to 15 mph W | 11% |
| Tuesday Night | 41°F | Partly Cloudy | 10 mph W | 9% |
Forecast source: National Weather Service (api.weather.gov) for Portland (43.633, -70.185). Updated through the day.
Growing snapshot for Portland
Last spring frost
Apr 26
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
6a
More local growing data for Portland: nearby ZIP 04108 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Bridgton
Brunswick
Casco
Cousins Island
Cumberland Center
Dunstan
Falmouth
Falmouth Foreside
Freeport
Gorham
Gray
Little Falls
Littlejohn Island
Naples
North Windham
Oak Hill
South Portland
South Windham
Standish
Steep Falls
Westbrook
Yarmouth
Climate data from the nearest NOAA station, Portland Intl Jetport, Me (5.7 mi from Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.