Southwest Harbor, ME Weather & Growing Conditions
Today
85°F
Sunny
Sunny, with a high near 85. Southwest wind around 17 mph, with gusts as high as 31 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 17 mph SW | 0% |
| Tonight | 65°F | Mostly Clear | 3 to 14 mph W | 0% |
| Wednesday | 84°F | Mostly Sunny | 2 to 8 mph SW | 0% |
| Wednesday Night | 65°F | Partly Cloudy then Patchy Fog | 2 to 8 mph SW | 5% |
| Thursday | 77°F | Patchy Fog then Mostly Sunny | 2 to 7 mph SW | 4% |
| Thursday Night | 67°F | Partly Cloudy then Patchy Fog | 1 to 6 mph SW | 8% |
| Friday | 79°F | Patchy Fog then Mostly Sunny | 1 to 8 mph SW | 7% |
| Friday Night | 65°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 to 7 mph W | 22% |
| Saturday | 79°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 3 to 9 mph W | 17% |
| Saturday Night | 64°F | Slight Chance Rain Showers then Mostly Cloudy | 3 to 8 mph SW | 16% |
| Sunday | 78°F | Mostly Sunny | 3 to 10 mph SW | 6% |
| Sunday Night | 65°F | Partly Cloudy | 6 to 10 mph SW | 6% |
| Monday | 79°F | Mostly Sunny | 6 to 13 mph SW | 7% |
| Monday Night | 64°F | Slight Chance Rain Showers | 6 to 12 mph W | 20% |
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 (17.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.