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.