Dave Killen | The Oregonian/OregonLive

The Pacific Northwest is sandwiched between two upper lows - one over southern California - the other over the Gulf of Alaska. This is keeping the marine clouds at bay Monday morning and any clouds that do creep into Portland from the lower Cascades will burn off early and leave a mostly sunny day and a high near 76.

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Rosemarie Stein | The Oregonian/OregonLive

Forecasters with the National Weather Service say high pressure will begin nudging into the area Monday and create clear skies for the beginning of the week.



Tuesday will have a sunnier start and warm up above seasonal averages with a high temperature of 83. Even the coast will have mostly sunny skies on Tuesday with highs in the upper 60s.

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The Oregonian/OregonLive

Onshore winds will increase Tuesday night, and bring in a deeper marine layer of clouds with most of the southern and mid-Willamette Valley seeing mostly cloudy skies for Wednesday morning. Portland will see clouds too on Wednesday morning and there’s the possibility for showers and even thunderstorms on Wednesday through most of Northwest Oregon.

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By Wednesday afternoon, sun breaks return and the high will be 81.

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