Portland, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a city in Cumberland County, Maine.
Today
76°F
Sunny
Sunny, with a high near 76. Southwest wind around 10 mph.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Sunny | 10 mph SW | 0% |
| Tonight | 63°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Wednesday | 73°F | Mostly Sunny | 5 to 10 mph SW | 0% |
| Wednesday Night | 65°F | Partly Cloudy | 5 to 10 mph SW | 5% |
| Thursday | 76°F | Mostly Sunny | 5 to 10 mph SW | 10% |
| Thursday Night | 68°F | Partly Cloudy | 5 to 10 mph SW | 9% |
| Friday | 79°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 27% |
| Friday Night | 67°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 26% |
| Saturday | 75°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 10 mph SW | 40% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph SW | 36% |
| Sunday | 76°F | Mostly Sunny | 0 to 10 mph SW | 5% |
| Sunday Night | 68°F | Mostly Clear | 5 to 10 mph SW | 6% |
| Monday | 78°F | Mostly Sunny | 5 to 15 mph SW | 12% |
| Monday Night | 67°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 15 mph W | 15% |
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 Aug 4, 2026.