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

What does the weather outlook for Portland look like in May? Explore our page to find a thorough overview of this month's weather conditions.

Temperatures

The month of May in Portland typically includes moderate temperatures and high rainfall. The temperature during the day can rise to approximately 18°C. At night, it falls to around 8°C.

Precipitation

Portland in May usually receives high rainfall, averaging around 108 mm for the month. Records from the past 30 years suggest that around 13 days will experience rain.

Average sunshine

The days are predominantly sunny, with an estimated total of around 244 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 prefer dry days with pleasant temperatures, 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 May

Min Temperature 8°C  

Max Temperature 18°C  

Water Temperature 8°C  

Chance of Rain 43%  

Precipitation 108 mm  

Rainy days 13 days  

Humidity 71%  

Sunshine 244 hours  

Percentage Sunshine 53%  

Where to go in the United States of America in May

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 8°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

5/10

Walking

5/10

Camping

3/10

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.