Month-by-month travel weather
Portland May weather
Portland, United States · May
Evenings can still cool down
May often brings more sunshine and mild temperatures that make outdoor plans easier.
Evenings can cool down, so a thin layer helps if you stay out late.
May averages at a glance
Average low
around 9–11°C
Average high
around 18–22°C
Average precipitation
around 45–75 mm
Rainy days
about 8–12 days
What to wear in May in Portland
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Mix of tees/long sleeves + a thin outer layer.
- • Optional sun protection on brighter days.
- • Light rain option as backup.
Travel tips for visiting Portland in May
- • Breezes near the river can feel cooler.
- • Longer daylight makes evenings feel more usable.
May weather in Portland — FAQ
Q. Is May still rainy?
A. Less than winter, but rain can still appear.
Q. Is May a good month to visit?
A. Often yes—keep an evening layer and a light rain option.
Explore Portland
These pages are connected so you can compare conditions and decide for yourself.