Southwest Harbor, ME Weather & Growing Conditions
Tonight
50°F
Chance Light Rain then Patchy Fog
A chance of rain before 10pm, then a chance of rain and patchy fog between 10pm and midnight, then patchy fog and a slight chance of rain. Cloudy, with a low around 50. Southeast wind around 12 mph. Chance of precipitation is 40%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Chance Light Rain then Patchy Fog | 12 mph SE | 37% |
| Wednesday | 56°F | Patchy Fog then Partly Sunny | 9 to 13 mph SW | 10% |
| Wednesday Night | 53°F | Partly Cloudy | 9 to 13 mph SW | 4% |
| Thursday | 58°F | Partly Sunny | 16 mph SW | 12% |
| Thursday Night | 54°F | Chance Light Rain | 10 to 16 mph SW | 32% |
| Friday | 57°F | Light Rain | 7 to 10 mph SW | 78% |
| Friday Night | 51°F | Light Rain | 7 to 14 mph SE | 87% |
| Saturday | 55°F | Light Rain | 16 mph SE | 86% |
| Saturday Night | 48°F | Light Rain | 14 mph W | 75% |
| Sunday | 53°F | Light Rain Likely | 13 mph W | 55% |
| Sunday Night | 45°F | Chance Light Rain then Mostly Cloudy | 12 mph W | 27% |
| Monday | 51°F | Chance Light Rain | 15 mph W | 26% |
| Monday Night | 43°F | Chance Light Rain | 15 to 20 mph NW | 26% |
| Tuesday | 51°F | Chance Light Rain | 20 mph W | 26% |
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
6b
Explore more for Southwest Harbor, ME: full frost dates · planting calendar · Maine frost dates
Climate data from the nearest NOAA station, Acadia Np, Me (18.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.