Snowfall is 3 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 100. On average, there are 144 sunny days per year in Portland, Oregon.
Summer Weather. Summer in Portland really starts in July and ends in September. Summer temperatures average around 80 degrees but do go over a 100 for one or two days a year. Overnight temperatures average around 60 degrees.