Portland weather in September (Maine, United States of America)

What's the typical weather in Portland for September? Our guide gives you the essential weather details for this month.

Temperatures

September in Portland generally includes pleasant temperatures and high rainfall. Anticipate daytime highs near 22°C, and cooler nights with temperatures around 12°C.

Precipitation

Portland in September usually receives high rainfall, averaging around 103 mm for the month. Analyzing past climate data, one can expect approximately 10 days of rain.

Average sunshine

The days are predominantly sunny, with an estimated total of around 228 hours of sunshine. These sun-filled days are perfect for spending time outside. Whether it's playing sports, visiting a park, or going for a bike ride.

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

For an in-depth look at the yearly conditions, visit our specialized Portland climate page with graphs.

 

Portland, monthly averages in September

Min Temperature 12°C  

Max Temperature 22°C  

Water Temperature 16°C  

Chance of Rain 33%  

Precipitation 103 mm  

Rainy days 10 days  

Humidity 77%  

Sunshine 228 hours  

Percentage Sunshine 61%  

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.

Weather conditions Weather

Temperatures

Precipitation

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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 Portland, 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. With a water temperature of around 16°C there is no need to bring your swimwear.

What To Do

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

Cycling

9/10

Walking

9/10

Camping

6/10

Outdoor sports

9/10

Interested in more climate information?

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

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.