Mark Graves | The Oregonian/OregonLive

The thermal low pressure that made Sunday a real scorcher will remain over the Portland metro area through Monday afternoon. We’ll set a new record high temp Monday with highs near 91 degrees. The old record was a measly 86 degrees set in 1973.

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Rosemarie Stein | The Oregonian/OregonLive

Forecasters for the National Weather Service note it’s a different story just a few miles south of Portland. For areas from the Canby-Newberg line and south, temperatures are cooler due to a deepening marine layer. Eugene will have a partly cloudy day and end up about 10 degrees cooler than Portland. Salem is expecting highs in the mid 80s.

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PDX made it to 90°F today. The last time we had a +90° day was Sept 11, 2017. While this may seem early, it isn't the earliest 90° day on record. That day was April 30,1998. pic.twitter.com/c2PXTR7iKk — NWS Portland (@NWSPortland) May 13, 2018

Rosemarie Stein | The Oregonian/OregonLive

Morning low temperatures were also quite high in Portland on Monday with most areas never dropping below the mid-to-upper 50s. The warm low temps will also help with the quick warmup for Monday.

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The Oregonian/OregonLive

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More widespread cooling occurs Monday night and Tuesday as the marine layer deepens and spreads more clouds inland. Temperatures should mellow to more seasonal highs for the rest of the week with even a slight chance of showers on Wednesday.

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Tuesday will see morning low clouds and then clearing with a high near 75. Clouds will thicken into Tuesday night.



By mid-week, we could see a slight chance of showers after 11 a.m. There will also be plenty of sun breaks. The high on Wednesday should be near 71 degrees.