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

Will it be warm or cold in South Portland this May? Our guide gives you the essential weather details for this month.

Temperatures

In May, South Portland typically experiences moderate temperatures and high rainfall. Daytime temperatures hover around 18°C, while nights can cool down to about 8°C.

Precipitation

South Portland in May usually receives high rainfall, averaging around 107 mm for the month. Past climate data indicates that roughly 13 days will see 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 your ideal day consists of dry skies and moderate temperatures June, July, August and September generally stand out with 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 South Portland climate page with graphs.

 

South Portland, monthly averages in May

Min Temperature 8°C  

Max Temperature 18°C  

Water Temperature 8°C *  

Chance of Rain 43%  

Precipitation 107 mm  

Rainy days 13 days  

Humidity 71% *  

Sunshine 244 hours *  

Percentage Sunshine 53% *  

Data from: Portland, the United States of America (2 KM, 1 Miles).

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 South 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 South 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.