Southwest Harbor, ME Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Southwest Harbor, a community in Hancock County, Maine.
Today
62°F
Slight Chance Light Rain then Partly Sunny
A slight chance of rain before 7am. Partly sunny, with a high near 62. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.
7-day forecast for Southwest Harbor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 62°F | Slight Chance Light Rain then Partly Sunny | 5 to 9 mph SW | 21% |
| Tonight | 51°F | Partly Cloudy | 3 to 7 mph SW | 3% |
| Thursday | 63°F | Mostly Cloudy | 8 to 14 mph SW | 4% |
| Thursday Night | 53°F | Chance Light Rain | 7 to 10 mph SW | 37% |
| Friday | 63°F | Light Rain Likely | 6 mph SW | 73% |
| Friday Night | 50°F | Rain | 2 to 8 mph SE | 97% |
| Saturday | 59°F | Light Rain | 8 to 12 mph SE | 90% |
| Saturday Night | 45°F | Light Rain Likely | 8 mph NE | 64% |
| Sunday | 54°F | Chance Light Rain | 8 to 12 mph NW | 49% |
| Sunday Night | 41°F | Slight Chance Light Rain then Mostly Cloudy | 3 to 7 mph W | 19% |
| Monday | 52°F | Chance Light Rain | 7 to 12 mph W | 28% |
| Monday Night | 38°F | Chance Light Rain | 10 mph W | 25% |
| Tuesday | 52°F | Mostly Sunny | 13 mph W | 13% |
| Tuesday Night | 37°F | Slight Chance Light Rain then Partly Cloudy | 10 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov) for Southwest Harbor (44.278, -68.329). Updated through the day.
Growing snapshot for Southwest Harbor
Last spring frost
Apr 27
First fall frost
Oct 22
Growing season
177 days
Hardiness zone
6a
More local growing data for Southwest Harbor: nearby ZIP 04679 weather · frost dates · planting calendar · Maine frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Acadia Np, Me (7.1 mi from Southwest Harbor). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.