Portland will see showers and cool temperatures to begin the week before things begin to dry out Tuesday and remain so for Thanksgiving and into the weekend. Sunday’s high temperature is expected to be about 47 degrees. The chance of rain is 90%, with up to a quarter inch of accumulation, according to the National Weather Service. Snow levels will hold at 3,500 to 4,000 feet and the Cascades will see another one to four inches of snow.