Updated: Sunday, 11:55 p.m.
How ironic is it that after our snow-starved 'winter-that-wasn't', parched spring and toasty warm summer, this will go down as one of the wettest months of August on record at Sea-Tac? Thanks to a couple of super-soggy storms this month (including Saturday's), the airport has picked up well over 3" of rain, well above the average of .88" for the month. With a day to go before it's over and another round of wet weather on the way, August 2015 is fighting to become the wettest one ever documented in our books.
We'll stay showery overnight with lows in the 50s by early Monday. Another disturbance moving in during the morning could make for a tough morning commute for back-to-work drivers. Afternoon highs will stay in the 60s as the steady rain gives way to scattered showers and thundershowers.
September will begin in a similar fashion. A broad, cool trough of low pressure over the Eastern Pacific (the opposite of that dry high that kept out much of the rain and snow over the least year) will continue to pump rounds of rain in our direction through Thursday. Occasionally we'll see some thunder, lightning and hail in the mix, too, and highs will stay in the 60s for most of the week.
Then, just in time for Labor Day Weekend, things start drying out and warming up. We'll ramp up into the low 70s by Friday and Saturday, with sunshine and back-to-normal middle 70s by Sunday. Great timing: cool, moist air for awhile to help in the firefighting efforts across the state, and then better conditions for outdoor activities for the holiday weekend.
Have a great week,
Meteorologist Shannon O'Donnell
The KOMO4 Forecast Team