Southwest Harbor, ME Weather & Growing Conditions
Today
60°F
Partly Sunny
Partly sunny, with a high near 60. Southwest wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 60°F | Partly Sunny | 8 mph SW | 6% |
| Tonight | 51°F | Partly Cloudy | 3 to 7 mph SW | 3% |
| Thursday | 61°F | Mostly Cloudy | 8 to 14 mph SW | 3% |
| Thursday Night | 53°F | Chance Light Rain | 7 to 10 mph SW | 37% |
| Friday | 61°F | Light Rain Likely | 2 to 6 mph SW | 74% |
| Friday Night | 50°F | Rain | 1 to 8 mph SE | 97% |
| Saturday | 57°F | Light Rain | 7 to 12 mph SE | 90% |
| Saturday Night | 45°F | Light Rain Likely | 8 mph NE | 65% |
| Sunday | 53°F | Chance Light Rain | 7 to 12 mph NW | 49% |
| Sunday Night | 41°F | Slight Chance Light Rain then Mostly Cloudy | 3 to 7 mph W | 19% |
| Monday | 51°F | Chance Light Rain | 7 to 12 mph W | 28% |
| Monday Night | 38°F | Chance Light Rain | 10 mph W | 26% |
| Tuesday | 51°F | Mostly Sunny | 9 to 13 mph W | 13% |
| Tuesday Night | 38°F | Slight Chance Light Rain then Partly Cloudy | 10 mph W | 16% |
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 Nov 4, 2026.