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Southwest Harbor (ME) Weather and Climate: A Comprehensive Guide

The temperature in Southwest Harbor can vary greatly throughout the year. The temperatures shift from warm to very cold. It also experiences much rain/snowfall throughout the year. Let's now guide you through the climate details for a complete overview.

Average maximum day and minimum night temperature

Depending on the time of the year, temperatures range from comfortable to very cold in Southwest Harbor. Average daytime temperatures reach a comfortable 23°C in July. In February, the coolest month of the year, temperatures drop to a very cold -0°C.

At night, you can expect cooler temperatures, with averages dropping to around -9°C during this month. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Southwest Harbor has a relatively rain/snowy climate with high precipitation levels, averaging 1297 mm of rain/snowfall annually. Southwest Harbor experiences moderate seasonal variation in rainfall, with monthly averages ranging from 145 mm in October, the wettest month, and 85 mm in August, the driest month.

The mean monthly precipitation over the year, including rain, hail and snow

Forecast for Southwest Harbor (ME)

Sun   Dec 22
-8°C | -15°C
NW 7 m/s
clear and no rain

clear and no rain

Mon   Dec 23
-4°C | -14°C
NW 5 m/s
almost clear and no rain

almost clear and no rain

Tue   Dec 24
-2°C | -8°C
SW 6 m/s
20 mm
overcast and heavy snow

overcast and heavy snow

The best time of year to visit Southwest Harbor in the United States of America

During the months of July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Which is the warmest month in Southwest Harbor?
    July has an average maximum temperature of 23°C and is the warmest month of the year.
  • Which is the coldest month in Southwest Harbor?
    The coldest month is February with an average maximum temperature of -0°C.
  • Which is the wettest month in Southwest Harbor?
    October tops the wettest month list with 145 mm of rainfall.
  • Which is the driest month in Southwest Harbor?
    August is the driest month with 85 mm of precipitation.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.