Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Southwest Harbor (ME) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Southwest Harbor.
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Climate overview of Southwest Harbor
Southwest Harbor, Maine, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 23°C (73°F) in July, while winters cool to 0°C (32°F) in January.
With around 1297 mm (51 in) of annual rain/snowfall, Southwest Harbor has a notably wet climate. However, this rain/snowfall is not evenly distributed, the city has warm summers and very cold winters. The wettest month is October.
Southwest Harbor Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Southwest Harbor - and find the best time to visit.
Monthly Temperature in Southwest Harbor
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 (73°F) in July. In January, the coolest month of the year, temperatures drop to a very cold 0°C (32°F).
At night, temperatures range from around 15°C (59°F) in July to -9°C (16°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Southwest Harbor
Southwest Harbor has a relatively rain/snowy climate with high precipitation levels, averaging 1297 mm (51 in) of rain/snowfall annually. Southwest Harbor experiences moderate seasonal variation in rainfall, with monthly averages ranging from 145 mm (5.7 in) in October, the wettest month, and 85 mm (3.3 in) in August, the driest month. For more details, please visit our Southwest Harbor Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Southwest Harbor
For comfortable weather, consider visiting Southwest Harbor in July, August and September. Conditions are usually least favourable in January, February, March, April, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
wet
Apr
wet
May
good
Jun
good
Jul
excellent
Aug
excellent
Sep
excellent
Oct
mixed
Nov
wet
Dec
cold
- Best overall: July, August and September
- Warmest weather: July and August
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Southwest Harbor
What is the best time to visit Southwest Harbor?
July, August and September typically offer the most optimal weather in Southwest Harbor. In contrast, January, February, March, April, November and December tend to have less optimal conditions. Southwest Harbor has warm summers and very cold winters.
What temperatures can I expect in Southwest Harbor?
Daytime highs range from 0°C (32°F) in January to 23°C (73°F) in July. Nighttime lows range from -9°C (16°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Southwest Harbor get?
Annual rainfall is around 1297 mm (51 in). October is the wettest month with 145 mm (5.7 in), while August is the driest with 85 mm (3.3 in).
Southwest Harbor 3-Day Forecast
Southwest Harbor on the map
Southwest Harbor is highlighted - select any city to see its climate.
Popular in October
Where to go in October - average daytime high across popular destinations.
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