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The National Weather Service has downgraded the heat warning issued for Western Washington to a heat advisory through 9 p.m. Friday.

Temperatures will not be as hot as expected due to the onshore marine flow. Instead of the mid to upper 90s, high temperatures are expected to mainly hit in the upper 80s to low 90s.

KING5 forecaster Lisa Van Cise predicts the coolest temps - 60s to 70s - to hit along the Washington coast and the warmest in the Cascade foothills, with temperatures in theupper 80s to low 90s.

So some of us will be cooler, others about the same from what we had just yesterday, said Van Cise.

A Red Flag Warning for the central and southern Puget Sound area expired Thursday, but there are additional warnings over the Cascades in Central Washington.

The Puget Sound Clean Air Agency still warns smog pollution in King Pierce and Snohomish counties could reach unhealthy levels this week as temperatures rise. Check current air quality

Click here to read the full forecast

While temperatures will still be warm Friday, the weekend will provide some relief as temperatures drop down in the 80s and 70s.

For Saturday, I think we'll still push in the lower 80s with a chance of a shower late in the day, said KING 5 Chief Meterologist Jeff Renner. Sunday there will be a chance of thundershowers with temps dropping back in the 70s.

Staying cool and safe

As temperatures soar, it's important to take steps to stay cool and healthy to avoid heat stroke and other heat-related illnesses. Here are tips from the Washington state Department of Health on how to stay healthy in extreme heat.

Some cities have also planned cooling centers where people can go to beat the heat.

Children and the elderly can be more susceptible to heat. Here are some tips from Safekids.org on the warning signs and how to keep kids safe in the heat and from the Centers for Disease Control for how to care for the elderly.

Click here for tips to keep pets safe in the heat, and remember to never leave your pet in a parked car on a hot day. On an 85 degree day the temperature inside a car with the windows opened slightly can reach 102 degrees within 10 minutes. Pets can quickly suffer heat stroke or organ failure and die. You could also be charged with animal cruelty.

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