PORTLAND-- The National Weather Service issued a warning Thursday for a heat wave throughout most of western Oregon and southwest Washington that was expected to last until the middle of next week.

High temperatures Monday and Tuesday may reach or slightly exceed 100 degrees in many areas, the statement reads. In addition to the hot temperatures early next week, it will become more humid, resulting in very mild nights.

Click to read the Special Weather Statement

Fans and air conditioners were flying off shelves around the Portland metro area as residents braced for the heat.

NWS offers the following tips for dealing with the heat wave:

  • Maintain proper hydration
  • Avoid extra exertion during the afternoon and early evening hours
  • Do not leave children or pets unattended in cars
  • Take extra care when recreating on the rivers

More: Keeping people and pets safe as temps climb

Click for more tips to stay cool and save energy from PGE

The following cooling centers will open in Multnomah County:

  • NORTHEAST PORTLAND Hollywood Senior Center, 1820 NE 40th Ave. 503-288-8303.
  • DOWNTOWN Meals on Wheels People, 1032 SW Main St. 503-953-8204
  • NORTH Pioneer United Methodist Church, 7528 N. Charleston Ave.
  • EAST COUNTY Ambleside Meals on Wheels People, 600 NE 8th St., Gresham, 503-988-3840

In Battle Ground, a cooling center will be open next Monday-Friday at 912 E Main St.

TriMet announced that MAXand WEStrains will be slowed down by about 10 mph as a precaution when the temperature exceeds 90 degrees. Click for more infor from TriMet

A spike in the heat led to a 99-degree high temperature in Portland last week, leading to a one-day heat advisory. But the metro area has not hit 100 degrees this year.

Temps next week could drop back into the high-80s starting Wednesday.

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