South Portland, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Portland, a city in Cumberland County, Maine.
Today
65°F
Sunny
Sunny, with a high near 65. East wind 5 to 10 mph.
7-day forecast for South Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 65°F | Sunny | 5 to 10 mph E | 0% |
| Tonight | 44°F | Partly Cloudy | 0 to 10 mph SW | 0% |
| Sunday | 63°F | Mostly Cloudy then Rain | 0 to 10 mph S | 78% |
| Sunday Night | 44°F | Rain then Rain Showers Likely | 5 to 10 mph NE | 76% |
| Monday | 65°F | Mostly Sunny | 5 to 15 mph N | 4% |
| Monday Night | 44°F | Partly Cloudy | 5 mph N | 0% |
| Tuesday | 65°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Tuesday Night | 44°F | Partly Cloudy | 0 to 10 mph NE | 1% |
| Wednesday | 64°F | Mostly Sunny | 10 mph NE | 0% |
| Wednesday Night | 43°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Thursday | 64°F | Chance Rain Showers | 5 to 10 mph NE | 26% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 15 mph NE | 33% |
| Friday | 64°F | Chance Rain Showers | 15 to 20 mph N | 33% |
| Friday Night | 44°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
Forecast source: National Weather Service (api.weather.gov) for South Portland (43.631, -70.286). Updated through the day.
Growing snapshot for South Portland
Last spring frost
Apr 26
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
6a
More local growing data for South Portland: nearby ZIP 04106 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
Portland
South Windham
Standish
Steep Falls
Westbrook
Yarmouth
Climate data from the nearest NOAA station, Portland Intl Jetport, Me (1.5 mi from South Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.