Southwest Harbor, ME Weather & Growing Conditions
Tonight
48°F
Clear
Clear, with a low around 48. Northwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Clear | 10 mph NW | 0% |
| Saturday | 60°F | Sunny | 8 mph NW | 0% |
| Saturday Night | 48°F | Partly Cloudy | 1 to 5 mph S | 0% |
| Sunday | 61°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 9 mph S | 17% |
| Sunday Night | 50°F | Chance Light Rain | 1 to 6 mph SW | 42% |
| Monday | 62°F | Mostly Sunny | 3 to 7 mph N | 10% |
| Monday Night | 47°F | Partly Cloudy | 7 mph N | 0% |
| Tuesday | 61°F | Mostly Sunny | 5 to 8 mph NE | 1% |
| Tuesday Night | 46°F | Partly Cloudy | 0 to 6 mph NE | 1% |
| Wednesday | 60°F | Sunny | 6 to 10 mph NE | 0% |
| Wednesday Night | 47°F | Partly Cloudy | 1 to 5 mph NE | 4% |
| Thursday | 60°F | Mostly Sunny then Slight Chance Rain Showers | 3 to 8 mph NE | 18% |
| Thursday Night | 48°F | Chance Rain Showers | 2 to 7 mph NE | 28% |
| Friday | 61°F | Chance Rain Showers | 10 mph NE | 32% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Southwest Harbor, ME
Last spring frost
Apr 27
First fall frost
Oct 22
Growing season
177 days
Hardiness zone
6a
Explore more for Southwest Harbor, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Acadia Np, Me (7.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.