South Portland, ME Weather & Growing Conditions
Overnight
46°F
Mostly Clear
Mostly clear, with a low around 46. Northwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Mostly Clear | 5 to 10 mph NW | 0% |
| Saturday | 66°F | Sunny | 5 to 10 mph N | 0% |
| Saturday Night | 46°F | Partly Cloudy | 0 to 10 mph SW | 0% |
| Sunday | 65°F | Chance Rain Showers | 0 to 10 mph S | 51% |
| Sunday Night | 47°F | Rain Showers Likely | 0 to 10 mph NE | 64% |
| Monday | 66°F | Mostly Sunny | 5 to 10 mph N | 11% |
| Monday Night | 46°F | Partly Cloudy | 5 to 10 mph NE | 2% |
| Tuesday | 65°F | Partly Sunny | 5 to 10 mph NE | 1% |
| Tuesday Night | 45°F | Partly Cloudy | 0 to 10 mph NE | 1% |
| Wednesday | 64°F | Mostly Sunny | 10 to 15 mph NE | 1% |
| Wednesday Night | 45°F | Partly Cloudy | 0 to 10 mph NE | 7% |
| Thursday | 64°F | Chance Rain Showers | 10 mph NE | 25% |
| Thursday Night | 46°F | Chance Rain Showers | 5 to 10 mph NE | 26% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 32% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South Portland, ME
Last spring frost
Apr 26
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
6a
Explore more for South Portland, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Portland Intl Jetport, Me (1.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.