Southwest Harbor, ME Weather & Growing Conditions
Tonight
48°F
Chance Light Rain
A chance of rain before 10pm, then a chance of rain and patchy fog. Cloudy, with a low around 48. Southeast wind 3 to 7 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Chance Light Rain | 3 to 7 mph SE | 45% |
| Wednesday | 59°F | Patchy Fog then Partly Sunny | 5 to 9 mph SW | 11% |
| Wednesday Night | 52°F | Partly Cloudy | 3 to 7 mph SW | 4% |
| Thursday | 61°F | Partly Sunny | 8 to 14 mph SW | 14% |
| Thursday Night | 54°F | Chance Light Rain | 7 to 12 mph SW | 28% |
| Friday | 61°F | Light Rain Likely | 6 mph SW | 74% |
| Friday Night | 50°F | Light Rain | 3 to 9 mph SE | 87% |
| Saturday | 57°F | Light Rain | 9 to 13 mph E | 86% |
| Saturday Night | 46°F | Light Rain | 9 mph NW | 75% |
| Sunday | 56°F | Light Rain Likely | 7 to 10 mph W | 56% |
| Sunday Night | 42°F | Chance Light Rain then Mostly Cloudy | 7 mph W | 28% |
| Monday | 53°F | Chance Light Rain | 8 to 13 mph NW | 25% |
| Monday Night | 40°F | Chance Light Rain | 12 mph NW | 25% |
| Tuesday | 52°F | Slight Chance Light Rain | 12 to 15 mph W | 24% |
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 (9.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.