Heat wave nearly over as 'natural air conditioning' kicks in

SEATTLE -- Not sure you can say "it was fun while it lasted" -- especially if you don't have air conditioning and you sweated through a Sunday night that barely dropped below 70, but there is growing evidence our season's first heat wave is on its last legs.

It appears someone has found the switch to flip on our natural air conditioning -- the cool breezes off the Pacific Ocean -- and thus we can say goodbye to the 90s now, and probably even the upper 80s. In its place, a cooling trend that should have highs temperatures back it the more Seattle-summer-normal 70s just in time for the holiday weekend.

But while we await the stronger marine breezes to arrive tonight, it's another very warm evening on tap around the Puget Sound region. Not quite as hot as earlier anticipated because we're already getting a bit of a seabreeze effect but still in the upper 80s around Seattle for a while. Lows will eventually drop to the low-mid 60s around Seattle but safely into the 50s up north and along the coast. The Excessive Heat Warning in effect for the Seattle area is set to expire Monday night.

The rest of this week will see a gradual cooling trend as the mega West Coast heat ridge slowly deflates and we'll see a slow increase the marine winds each day, which in turn will gradually decrease our high temperatures.

Tuesday might even have a brief period of morning clouds near the Sound before they quickly evaporate but enough cooler air will be around to keep highs in the low 80s as opposed to the low 8 billions, as I'm sure it's felt to some recently.

For Wednesday, we'll cool down closer to 80 with perhaps a bit more in the way of morning clouds.

Fourth of July Thursday is now shaping up to be just about perfect with marine clouds through late morning or midday, then increasing sunshine as they burn away. Highs should top out in the mid-upper 70s with pleasant conditions for the various fireworks shows around the region.

The rest of the holiday weekend will feature the fairly typical summertime pattern of morning clouds and afternoon sunshine with highs in the 70s - giving us something more to celebrate besides the nation's birthday.