A shift in the weather pattern could make Saturday the wettest day in the Seattle area since April 13.

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A cool, damp weather pattern that may make Saturday the wettest day in Seattle since mid-April could bring relief to firefighters battling Cascade Mountain blazes, but have Puget Sound area residents wondering where their sizzling summer went.

After a sunny, warm Friday, the Seattle area is forecast to have a string of days with high temperatures below the normal early August high of 77.

Saturday is forecast to have a 20 percent chance of showers during the day, rising to 60 percent in the evening.

Weather Service meteorologist Johnny Burg said it’s difficult to predict the amount of rain, but models indicate Seattle could get up to a quarter-inch of rain Saturday.

That’s far from a torrent, but it would be the wettest day at Seattle-Tacoma International Airport since April 13, when .55 inches of rain fell.

Sunday has a 30 percent chance of showers in the Seattle area.

Heavier and more widespread rain, Burg said, is expected during the weekend in the Olympia area, as well on the coast, and in the Olympics and the North Cascades, where rainfall to dampen forests and rinse smoke out of air would be welcome.

The cooler days would be in sharp contrast to the record heat of June and July. July, the hottest month ever recorded in Seattle, opened with five straight days in the 90s.

A note for trivia buffs: In the last 100 days, the daily high temperature at Seattle-Tacoma International Airport has been above normal 74 times, below normal 24 times and right on the normal mark twice.

On the forest-fire lines, thunderstorms are possible. But Jean Nelson-Dean of the Northwest Interagency Coordination Center said on balance, firefighters view the cooler air and chance of rain as beneficial.