South Portland Weather in May
May in South Portland typically sees daytime highs of 18°C (64°F) and nighttime lows of 8°C (46°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in South Portland in May
You can expect rain on roughly 13 days based on historical data, averaging 107 mm (4.2 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in South Portland in May
If you're visiting South Portland in May, expect highs of 18°C (64°F) and overnight lows around 8°C (46°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights drop to 8°C (46°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in South Portland in May
The days are predominantly sunny, with an estimated total of around 244 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.
Average water temperature in May
The water temperature is only 8°C (46°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.If you prefer dry days with pleasant temperatures, June, July, August and September typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our South Portland's climate page.
South Portland Temperature in May
Min Temperature
8°C (46°F)
Max Temperature
18°C (64°F)
Water Temperature
8°C (46°F) *
Chance of Rain
43%
Precipitation
107 mm (4.2 in)
Rainy days
13 days
Humidity
71% *
Sunshine
244 hours *
Percentage Sunshine
53% *
Best Places 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. See all of the United States of America in May →
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What to Wear in South Portland in May
For South Portland in May, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 8°C (46°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in South Portland in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our South Portland's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full South Portland climate overview or explore weather in the United States of America.
