Portland, ME Weather & Growing Conditions
Overnight
46°F
Mostly Clear
Mostly clear, with a low around 46. North wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Mostly Clear | 5 mph N | 0% |
| Saturday | 63°F | Sunny | 5 to 10 mph NE | 0% |
| Saturday Night | 46°F | Partly Cloudy | 0 to 10 mph SW | 0% |
| Sunday | 61°F | Mostly Cloudy then Rain | 0 to 10 mph S | 78% |
| Sunday Night | 46°F | Rain then Chance Rain Showers | 5 to 10 mph NE | 76% |
| Monday | 63°F | Mostly Sunny | 10 to 15 mph N | 4% |
| Monday Night | 45°F | Mostly Cloudy | 5 to 10 mph N | 0% |
| Tuesday | 62°F | Partly Sunny | 5 to 10 mph NE | 0% |
| Tuesday Night | 44°F | Partly Cloudy | 0 to 10 mph NE | 1% |
| Wednesday | 65°F | Mostly Sunny | 10 to 15 mph NE | 0% |
| Wednesday Night | 43°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Thursday | 63°F | Chance Rain Showers | 5 to 10 mph NE | 25% |
| Thursday Night | 44°F | Chance Rain Showers | 5 to 15 mph NE | 33% |
| Friday | 64°F | Chance Rain Showers | 15 to 20 mph N | 33% |
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 (0.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.