South Portland, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Portland, a city in Cumberland County, Maine.
This Afternoon
79°F
Sunny
Sunny, with a high near 79. Northwest wind around 10 mph, with gusts as high as 25 mph.
7-day forecast for South Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Sunny | 10 mph NW | 0% |
| Tonight | 46°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Saturday | 66°F | Sunny | 5 to 10 mph SE | 0% |
| Saturday Night | 46°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 65°F | Partly Sunny then Slight Chance Light Rain | 0 to 10 mph S | 24% |
| Sunday Night | 48°F | Chance Light Rain | 0 to 10 mph W | 54% |
| Monday | 67°F | Slight Chance Light Rain then Mostly Sunny | 5 to 10 mph NE | 17% |
| Monday Night | 46°F | Partly Cloudy | 0 to 10 mph NE | 4% |
| Tuesday | 64°F | Partly Sunny then Slight Chance Rain Showers | 10 mph NE | 15% |
| Tuesday Night | 45°F | Mostly Cloudy | 5 to 10 mph NE | 13% |
| Wednesday | 64°F | Mostly Sunny | 10 to 15 mph NE | 5% |
| Wednesday Night | 45°F | Partly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NE | 18% |
| Thursday | 64°F | Slight Chance Rain Showers | 10 mph NE | 23% |
| Thursday Night | 47°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
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 18, 2026.