Updated Sunday 11:35 p.m.
We're heat wavin'! We're closing out the month of July with a seasonably appropriate warm-up. Highs topped out anywhere from the middle 70s (ocean beaches) to middle 80s (Seattle to Olympia) on Sunday, and as a ridge of high pressure strengthens over the Northwest early this week, look for even warmer readings to come.
Clear and starry skies overnight will allow temps to drop into the 50s to low 60s, and once the sun comes up on Monday, we'll warm quickly. Afternoon temperatures in Bellevue and Auburn will hover just below 90 degrees, with low 80s around Bellingham and upper 80s in Tacoma. Tuesday will feature similar heat as the ridge hits its peak.
There is some monsoonal moisture working its way into Oregon right now, and we'll have to watch those thundershowers closely in the days to come. Some of the storm cells may creep up the Cascade crest as the week goes on, and the chance for more lightning in the fire zones is certainly of concern.
Winds from the Pacific will turn in our direction later in the week, and this stronger onshore flow will serve to chip away at the heat a little bit. Highs late in the week should drop back into the upper 70s to low 80s, and we'll notice more morning cloud cover hanging around.
By Seafair weekend, the ridge rebuilds and high temperatures should come back up into the low to middle 80s around the shores of Lake Washington--summer perfection for checking out the hydros and Blue Angels!
Have a great week,
Meteorologist Shannon O'Donnell
The KOMO4 Forecast Team