May · United States
Best time to visit Portland in May Weather, crowds & prices
Weather in Portland in May
Average temperature 12°C, 110 mm of rain, about 25 days with 6+ hours of sunshine and 82% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
7.0/10
Ranked #5 of 12 months
- Avg temp
- 12°C
- Rainfall
- 110 mm
- Humidity
- 82%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Portland scores 7.0/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 12°C, 110 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Portland pairs a walkable downtown of parks and bookshops with the waterfalls and wine of the Columbia gorge.
May holds up well in Portland — 5th best month
May averages 12°C (54°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Monthly rainfall reaches 110 mm — wet for this destination — but about 25 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 7/10 here, 5th of 12 months, against 10/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella.
Plan for mid-season pricing, with crowds are moderate.
Flexible dates? August scores 3 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Portland in May?
- In May, Portland averages 12°C, 110 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 7.0/10.
- Is May a good time to visit Portland?
- May earns a 7.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Portland in May?
- Expect about 110 mm of rain in May. Average humidity is 82% and there are about 25 days with 6+ hours of sunshine.
Curated in Portland
Tickets & experiences
Things to do in Portland
Portland, United States. Live activities and tours from GetYourGuide, matched to this destination.