[header] How to pack for a trip to portland, oregon [title] Consider the season. [step] The season of your visit should definitely determine what you bring. Winters are cold but usually mild (30-55 degrees f), and frost is typical most mornings with the occasional disruptive snowfall. 
Rain is typical every season, though markedly less in july and august when the weather frequently hovers at 75 and above, up to 100 on the very hottest days. Autumn is brisk but generally pleasant, and layering is key.