Portland Metro Monday Weather: Cool start to a mostly sunny day with warming temperatures

Under mostly clear morning skies, Monday starts out chilly with most areas in the low-to-mid 40s. Some foothill locations reported temps in the high 30s around 5:30 a.m.

Low morning temps as of 5:30 a.m. 

The National Weather Service sees a ridge of relatively high atmospheric pressure aloft developing over our area for Monday pushing out a departing shortwave that kept things cloudy and cool. High pressure should keep skies clear and allow for a strong warm-up through the middle of the week. Expect highs on Monday of 77 degrees.

Offshore winds and a northerly flow will increase temperatures into Tuesday. We’ll see sunny skies all day and a high of 84 for Tuesday.

Forecasters are seeing some models suggesting deepening moisture along the coast Wednesday morning and an increasingly onshore flow that could bring back rain to the Portland metro area by Wednesday night. So far, Wednesday still looks mostly sunny and warm.

There are some chances of thunderstorms by Wednesday afternoon depending on how quickly the flow shifts and clouds begin to move into the valleys. Best chances for thunder are along the Cascades. Wednesday’s high is expected to reach 80 degrees.