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
88°F
Sunny
Sunny, with a high near 88. West wind 10 to 15 mph.
7-day forecast for South Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 10 to 15 mph W | 0% |
| Tonight | 61°F | Mostly Clear | 5 to 10 mph SW | 0% |
| Wednesday | 85°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 66°F | Partly Cloudy | 0 to 10 mph SW | 5% |
| Thursday | 88°F | Sunny | 0 to 10 mph SW | 13% |
| Thursday Night | 70°F | Partly Cloudy | 0 to 5 mph SW | 12% |
| Friday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph SW | 28% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 28% |
| Saturday | 86°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SW | 42% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 37% |
| Sunday | 88°F | Sunny | 0 to 10 mph SW | 5% |
| Sunday Night | 69°F | Mostly Clear | 5 to 10 mph SW | 6% |
| Monday | 89°F | Sunny | 5 to 10 mph SW | 13% |
| Monday Night | 67°F | Partly Cloudy | 5 to 10 mph W | 14% |
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 Aug 4, 2026.