Portland Weather in May
Portland in May averages 23°C (73°F) during the day and 11°C (52°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Portland in May
Historically, approximately 13 days this month are expected to have rain, averaging 106 mm (4.2 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Portland in May
In May, expect high temperatures in Portland, with highs of 23°C (73°F) and lows of 11°C (52°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 11°C (52°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Portland in May
Expect sunny days throughout the month, with an estimated 313 hours of sunshine. This makes it a pleasant time to visit Portland.Should you favor a climate that's both dry and comfortably warm, July and September typically offer the most agreeable 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 Portland's climate page.
Portland Temperature in May
Min Temperature
11°C (52°F)
Max Temperature
23°C (73°F)
Chance of Rain
43%
Precipitation
106 mm (4.2 in)
Rainy days
13 days
Humidity
65% *
Sunshine
313 hours *
Percentage Sunshine
68% *
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 Portland in May
For 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in 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 Portland's climate page.
Temperature Rainfall Sunshine Humidity
See the full Portland climate overview or explore weather in the United States of America.
