Climate Averages Sperling’s Best Places sees about 156 days of sunshine 43 inches of rain each year Portland with the heaviest precipitation Portland with the heaviest precipitation Portland ranks high on Sperling’s Comfort Index. 144 days of sun precipitation 100 days a year Best Places: Portland, Oregon Comfort Index (Climate) more overcast and dark mornings comfort index http://www.bestplaces.net/climate/city/oregon/portland Portland OR 144 sunny days a year according to BestPlaces.net