Portland, ME Weather & Growing Conditions
Tonight
54°F
Mostly Clear
Mostly clear, with a low around 54. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Mostly Clear | 5 to 10 mph S | 0% |
| Sunday | 60°F | Mostly Cloudy then Light Rain Likely | 5 to 15 mph S | 82% |
| Sunday Night | 53°F | Rain | 5 to 15 mph NE | 83% |
| Monday | 62°F | Mostly Sunny | 10 to 15 mph N | 2% |
| Monday Night | 50°F | Partly Cloudy | 10 to 15 mph N | 0% |
| Tuesday | 58°F | Mostly Sunny | 5 to 10 mph NE | 0% |
| Tuesday Night | 49°F | Partly Cloudy | 0 to 15 mph E | 0% |
| Wednesday | 58°F | Mostly Sunny | 10 to 15 mph NE | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 5 to 10 mph NE | 0% |
| Thursday | 58°F | Slight Chance Rain Showers | 10 mph NE | 16% |
| Thursday Night | 51°F | Slight Chance Rain Showers | 5 to 15 mph NE | 24% |
| Friday | 59°F | Chance Rain Showers | 15 to 25 mph NE | 36% |
| Friday Night | 54°F | Chance Rain Showers | 20 to 25 mph NE | 42% |
| Saturday | 60°F | Chance Rain Showers | 25 mph N | 41% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portland, ME
Last spring frost
Apr 26
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
6a
Explore more for Portland, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Portland Intl Jetport, Me (9.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.