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PORTLAND -- It didn't set any records, but it was a dramatic jump in the temperature: The high in Portland hit 99 degrees Tuesday, KGW Meteorologist Nick Allard said.

The National Weather Service issued a Heat Advisory for the inland valleys, coastal mountains, Cascade foothills and western and central Columbia River Gorge of Southwest Washington and Northwest Oregon from 11 a.m. until 9 p.m. Tuesday.

Tips:Keeping people &pets safe as temps climb

The heat was causing some MAXand WES trains to run at reduced speeds. In extremely hot conditions, drivers stay below 35 mph, to prevent problems along the overhead wires and tracks. Riders were advised to expect up to 15 minute delays on all afternoon trips.

The temperature climbed to 99 degrees by 6 p.m.

Cooler coastal winds returned Tuesday night and brought the temperatures back down, KGWMeteorologist Mat Zaffino explained.

The temperature Wednesday drops back down into the low to mid-80s, where it'll hover for the remainder of the week and into Independence Day weekend.

The record high for July 1 at Portland International Airport was 105 degrees in 1942, and Tuesday wasn't anywhere near that hot, but it was more than a 10-degree change from Monday afternoon.

Forecast | Weather Cameras | Heat Maps

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