Soaring temperatures set new record highs throughout the weekend in Portland.

The city topped out at 100 degrees on Sunday, breaking the old record of 96 degrees set in 2003.

And the 98-degree high on Saturday shattered the previous record, also set in 2003.

Jeremiah Pyle, a National Weather Service meteorologist, said Vancouver, Hillsboro, Troutdale and Eugene also ended the weekend with new record highs.

This heatwave won't last much longer, however. And forecasters say the peak is already over.

"There's a gradual cooling trend starting tomorrow," Pyle said.

Monday looks to be cooler - but still warm.

"Right now we're forecasting a high of 88 for Portland," Pyle said. "After 99, maybe 88 won't feel so bad."

Each day, the temperature is expected to drop. Once midweek hits, forecasters say relief is in store.

"Wednesday and Thursday are the big change days," Pyle said.

By Thursday, the weather service expects a high in the upper 60s.

That's much closer to typical: The average high for this time of year is in the low 70s.

-- Emily E. Smith

esmith@oregonian.com

503-294-4032; @emilyesmith