Southwest Harbor, ME Weather & Growing Conditions
Today
73°F
Sunny
Sunny, with a high near 73. Southwest wind 15 to 18 mph, with gusts as high as 33 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Sunny | 15 to 18 mph SW | 0% |
| Tonight | 61°F | Mostly Clear | 3 to 16 mph W | 0% |
| Wednesday | 72°F | Mostly Sunny | 3 to 9 mph SW | 0% |
| Wednesday Night | 60°F | Partly Cloudy then Patchy Fog | 3 to 9 mph SW | 4% |
| Thursday | 70°F | Patchy Fog then Mostly Sunny | 3 to 8 mph SW | 4% |
| Thursday Night | 62°F | Partly Cloudy then Patchy Fog | 2 to 7 mph SW | 8% |
| Friday | 73°F | Patchy Fog then Mostly Sunny | 2 to 9 mph SW | 8% |
| Friday Night | 65°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 8 mph W | 22% |
| Saturday | 78°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 2 to 9 mph SW | 17% |
| Saturday Night | 64°F | Slight Chance Rain Showers | 2 to 8 mph SW | 17% |
| Sunday | 77°F | Mostly Sunny | 2 to 10 mph SW | 7% |
| Sunday Night | 64°F | Partly Cloudy | 5 to 10 mph SW | 7% |
| Monday | 78°F | Mostly Sunny | 5 to 13 mph SW | 7% |
| Monday Night | 64°F | Slight Chance Rain Showers | 6 to 10 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
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 (12.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.