PORTLAND, Ore. (AP) — The Northwest braced for another heat wave Saturday, a day after Denver hit 101 degrees Fahrenheit, breaking a record set in 1877.

Meteorologists on Saturday issued a heat advisory in Portland through Monday, and they also issued a fire weather watch for the state’s populous Willamette Valley.

Mini heat wave headed for Seattle area

Authorities opened cooling centers for those without air conditioning and extended library hours.

“Conditions are heating up, drying out and could get a bit windy today. Today is a day that fires could easily spread,” the National Weather Service in Portland wrote on Twitter.

In Denver, temperatures dipped Saturday into the lower 90s after peaking Friday. It was the fifth time this year that the mercury climbed to 100 or above in Denver.

In Idaho, temperatures in Boise could rise as high as 103. the National Weather Service said the expected high wouldn’t break the record of 106 set in 2018.

Portland temperatures neared 100 for an entire week recently, with highs peaking at 102. Seven deaths in Oregon are being investigated as possibly heat-related from that heat wave.

A person dives into the water from a pedestrian bridge at Lake Union Park into the water during a heat wave hitting the Pacific Northwest, Sunday, June 27, 2021, in Seattle. Yesterday set a record high for the day with more record highs expected today and Monday. (AP Photo/John Froschauer)