Portland · May
Run in the morning.
Cool month: average high 68°F, low 49°F. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
68° / 49°F
Humidity
73%
Rain days
13/mo
Wind
9 mph
What May feels like in Portland
Sunrise
05:39
Mid-month average
Sunset
20:35
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in Portland in May
The kit for May in Portland: a long-sleeve or light jacket for the first mile, a water-resistant cap or jacket on standby.
May vs the surrounding months
vs April
+8° avg high
-5 rain days
Portland in April →
May
68°F avg high
13 rain days
Best: morning
vs June
-7° avg high
+3 rain days
Portland in June →
Frequently Asked Questions
What is the best time of day to run in Portland in May?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Portland in May?+
Average high 68°F, average low 49°F.
How does May compare to surrounding months in Portland?+
Compared to April (avg high 59°F), May is warmer. Compared to June (avg high 75°F), May is cooler.
Does it rain often in Portland in May?+
Expect about 13 measurable rain days in May, on average.