Summer hasn’t lost its grip.

Unusually hot weather during the day and some mild overnight lows this weekend are going to make for “a fairly uncomfortable combination of temperatures,” National Weather Service meteorologist Dustin Guy said.

By the weekend, Western Washington could see some record-breaking highs.

A warming trend started Thursday, Guy said, but “you won’t really notice the big bump in temperatures until” Friday. Highs will stay in the upper 70s before Friday cranks the dial up to the mid-80s and ushers in a heat advisory that will last until Monday.

That means anyone with heat sensitivities is at greater risk of succumbing to heat-related illnesses. So make sure you’ve got your fans, AC, ice pops and head full of cool thoughts prepared.

Temperatures could get “pretty close to that 90-degree mark” on Saturday and Sunday while overnight lows will hit the lower to mid-60s, Guy said.

Highs over the weekend are threatening to break records, Guy said. Saturday’s projected high is 89 in Seattle, just a couple degrees shy of the historical record for the day. Sunday, we’re looking at 87 degrees, a degree shy of the record.

The average high is about 77 degrees this time of year, Guy said.

Areas south and east of Seattle “will definitely crack the 90-degree mark,” Guy said. Places like the Cascade foothills, Aberdeen, Enumclaw, Olympia and Chehalis will all see temperatures well into the 90s this weekend and even triple digits are possible.

We’ve got a combination of factors to thank for the marathon of sweaty temps.

A dome of high pressure is causing air to compress and warm as it sinks, Guy said. With a lack of marine air flowing in from the ocean, we’ve got few chances to cool down.

Speaking of, get ready to hunker down in the heat.

“We’re not looking at a drastic cooldown as we go into the early part of next week,” Guy said. Temperatures will hang anywhere from 85 to 90 into the early to middle part of next week, “so we’re in for a fairly lengthy stretch of some warm temperatures.”