Portland weather: Blazing heat to return this week

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After a weekend of cooler temperatures, some cloud cover and even a tiny bit of rain, blazing sunshine will return to the Portland area this week.

Monday is expected to kick off a string of 90-plus degree days, and temperatures could even flirt with triple digits.

“We’re not done with heat yet,” said Colby Neuman, a meteorologist with the National Weather Service in Portland.

In fact, Portland could come close this week to breaking an all-time record for number of days topping 90 degrees in a year, Neuman said. The record was set in 2015, when Portland had 29 days where the high was 90 degrees or hotter.

“I would tend to guess that in the next week, we’re going to end up eclipsing that,” Neuman said.

So far this year, Portland has reached 90 degrees 26 times.

In the past 50 years, Portland has only had four summers with more than 20 days reaching or passing the 90-degree mark. All have occurred in the past five years, according to the weather service. 

This past weekend, the heat took a momentary hiatus. Clouds rolled in with small amounts of rain, and clean air pushed the wildfire smoke out of the area Saturday.

One-hundredth of an inch of rain was measured Saturday at Portland International Airport, according to the weather service. The precipitation broke a streak of 39 consecutive days without any rain at the airport. (The summer of 1967 set the all-time record of no rain with 71 consecutive days of dry weather, the weather service says.)

“Technically, it did rain but it wasn’t enough to help out plants or the vegetation,” Neuman said. “The streak is over, but the dry weather continues on.”

By Sunday, the sun returned but was muted by haze from wildfires. Temperatures hovered around 80 degrees.

The haze, Neuman said, came down overnight Saturday from wildfires in Canada. It stretches from Lincoln City to Mount Hood and down to the southern Portland suburbs, he said.

Neuman said the haze is expected to stick around until mid-morning Monday. After that, he said, winds should shift and the area should see bluer skies. Monday’s high is expected to hit 94 degrees.

Tuesday is supposed to be the week’s hottest day with a high of 98 degrees, and Neuman said it’s not a stretch to wonder whether Portland could hit 100.

“It’s not out of the question on Tuesday,” he said.

The rest of the week is predicted to be warm but should cool down — but maybe not as much as some may like.

“Cool off is relative here,” Neuman said. “It’s still going to be pretty hot on Wednesday.”

Neuman said Wednesday is likely to see a high of around 90 degrees. For the rest of the week, he said, temperatures are expected to peak in the mid-to-upper 80s, before likely warming up to around 90 degrees again by the weekend.

— Rebecca Woolington

rwoolington@oregonian.com

503-294-4049; @rwoolington

2018-08-13 00:00:29

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