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
61°F
Cloudy
Cloudy. High near 61, with temperatures falling to around 55 in the afternoon. East wind around 5 mph.
7-day forecast for South Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 61°F | Cloudy | 5 mph E | 13% |
| Tonight | 47°F | Slight Chance Light Rain then Mostly Cloudy | 0 to 5 mph SE | 16% |
| Wednesday | 72°F | Mostly Sunny | 0 to 10 mph SW | 6% |
| Wednesday Night | 51°F | Partly Cloudy | 5 mph SW | 1% |
| Thursday | 71°F | Partly Sunny then Slight Chance Light Rain | 5 to 15 mph SW | 20% |
| Thursday Night | 55°F | Slight Chance Light Rain | 5 to 10 mph SW | 18% |
| Friday | 68°F | Light Rain Likely | 5 mph S | 66% |
| Friday Night | 48°F | Light Rain | 5 to 10 mph E | 83% |
| Saturday | 60°F | Light Rain | 5 to 10 mph NE | 76% |
| Saturday Night | 41°F | Light Rain Likely | 5 mph N | 55% |
| Sunday | 58°F | Chance Light Rain | 5 mph NW | 39% |
| Sunday Night | 38°F | Slight Chance Light Rain | 0 to 5 mph NW | 16% |
| Monday | 57°F | Chance Light Rain | 5 to 10 mph W | 34% |
| Monday Night | 36°F | Chance Light Rain | 5 to 10 mph NW | 36% |
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 Nov 3, 2026.