Summer heat returns, cooling trend in sight for Portland

PORTLAND, Ore. (KOIN) -- Summer heat returns to the Pacific Northwest as Portland area temperatures climb into the 90s once again.

The calendar might read September, but Portland will continue to feel the heat Tuesday. Mostly sunny skies return as highs warm into the low 90s along the Willamette Valley Tuesday afternoon and evening. No records are expected to be broken, but highs will remain warmer than average through the middle of the week.

Extreme heat warnings and heat advisories go into place for much of eastern Washington, the Columbia River Gorge, and north-central Oregon Tuesday. The extreme heat is expected to last through the middle of the week.

Isolated thunderstorms, warm temperatures, and gusty winds will keep the wildfire threat elevated through the central and southern Ca