The National Weather Service has issued a Wind Advisory that calls for gusts overnight of up to 55mph, but sustained winds of around 30mph. Power outages are not unlikely. Check for outages and restoration times here: https://seattle.gov/city-light/outages
The advisory is for overnight through noon on Tuesday.

URGENT - WEATHER MESSAGE National Weather Service Seattle
WIND ADVISORY NOW IN EFFECT FROM NOON TODAY TO NOON PST TUESDAY...
* WHAT...South to southwest winds 20 to 30 mph with gusts up to 50 to 55 mph expected.
* WHERE...Portions of northwest and west central Washington.
* WHEN...From noon today to noon PST Tuesday.
* IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.
PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicles. Secure outdoor objects. Secure outdoor objects.
The area wide forecast calls for:
Today
Rain, mainly after 9am. High near 51. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tonight
Rain, mainly before 3am. Steady temperature around 48. Breezy, with a south wind 24 to 29 mph, with gusts as high as 41 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
Rain, mainly before 4pm. High near 52. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 100%. New precipitation amounts of less than a tenth of an inch possible.