Portland weather in May
Long-run climate averages for Portland, OR in May, plus what the forecast models say for the days ahead.
In May, Portland averages 68°F by day and 47°F at night. The wettest month is usually December.
May in Portland averages a daytime high of 68°F and an overnight low of 47°F, which reads as mild for this part of the world. Across the whole year Portland sees roughly 59 inches of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like — for that, see the live Portland forecast with every model compared and how much they currently agree.
Portland weather by month
what to expect in Portland through the yearHere is Portland's typical weather in each month: the average daytime high and overnight low in °F, how each month feels, and the wettest month marked. Use it to plan any trip to Portland by season.