Southwest Harbor (ME) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Southwest Harbor.
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 February.
With around 1297 mm (51 in) of annual rain/snowfall, Southwest Harbor has a notably wet climate. 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 February, 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 February.
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
Rainfall during this time ranges from 85 mm (3.3 in) in August to 137 mm (5.4 in) in June. This means you can expect a mix of sunny days and occasional showers. Ready to plan your travels but need destination ideas? Our smart tool recommends places based on the climate conditions you prefer. Start planning with our destination weather tool.
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.
What temperatures can I expect in Southwest Harbor?
Daytime highs range from 0°C (32°F) in February 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 (ME) 3-Day Forecast
Southwest Harbor on the map
Southwest Harbor is highlighted — select any city to see its climate.
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Where to go in July — average daytime high across popular destinations.
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