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Southwest Harbor weather in September (Maine, United States of America)

Is Southwest Harbor a good destination in September, weather-wise? Wondering about the weather this month? Our guide has all the details you need.

Temperatures

The weather in Southwest Harbor during September is typically perfect, with pleasant temperatures and moderate rainfall. September is typically considered a summer month. The daytime often sees temperatures reaching 20°C, but nighttime brings a cool-down to 11°C.

Precipitation

Southwest Harbor in September usually receives moderate rainfall, averaging around 94 mm for the month. The climate data from previous years indicates that there are typically about 10 days days of rain.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit Southwest Harbor. July, August and September typically offer the best circumstances. While January, February, March, April, November and December tend to showcase less optimal conditions.

Need inspiration to choose your next destination? Our innovative weather planner helps you discover the perfect getaway tailored to your ideal climate conditions.

 

Southwest Harbor, monthly averages in September

Min TemperatureMin Temperature 11°C  
Max TemperatureMax Temperature 20°C  
Chance of RainChance of Rain 34%  
PrecipitationPrecipitation 94 mm  
Rainy daysRainy days 10 days  

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Southwest Harbor, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling
9/10
Walking
9/10
Camping
8/10
Outdoor sports
9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Southwest Harbor.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.