Portland, ME Weather & Growing Conditions
Tonight
55°F
Mostly Clear
Mostly clear, with a low around 55. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Mostly Clear | 5 to 10 mph S | 0% |
| Sunday | 60°F | Mostly Cloudy then Rain | 5 to 15 mph S | 80% |
| Sunday Night | 53°F | Rain | 5 to 10 mph NE | 83% |
| Monday | 63°F | Mostly Sunny | 10 to 15 mph N | 3% |
| Monday Night | 50°F | Mostly Cloudy | 10 mph N | 0% |
| Tuesday | 59°F | Mostly Sunny | 5 to 10 mph NE | 0% |
| Tuesday Night | 50°F | Partly Cloudy | 0 to 10 mph E | 0% |
| Wednesday | 59°F | Mostly Sunny | 10 to 15 mph NE | 0% |
| Wednesday Night | 49°F | Partly Cloudy | 0 to 10 mph NE | 0% |
| Thursday | 59°F | Mostly Sunny then Slight Chance Rain Showers | 10 mph NE | 15% |
| Thursday Night | 51°F | Slight Chance Rain Showers | 5 to 15 mph NE | 23% |
| Friday | 60°F | Chance Rain Showers | 15 to 20 mph NE | 35% |
| Friday Night | 53°F | Chance Rain Showers | 15 to 25 mph NE | 42% |
| Saturday | 61°F | Chance Rain Showers | 20 to 25 mph N | 41% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portland, ME
Last spring frost
May 2
First fall frost
Oct 10
Growing season
160 days
Hardiness zone
6a
Explore more for Portland, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Brunswick Nas, Me (11.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.