Mercer Island, WA is known for its mild temperatures throughout the year, with an average high of around 65 degrees Fahrenheit in the summer and an average low of about 40 degrees Fahrenheit in the winter. The area experiences very little snow or rain on an annual basis, making it a great place to enjoy outdoor activities regardless of the season. The climate is generally dry and pleasant, contributing to Mercer Island's reputation as a desirable place to live.
Mercer Island, Washington gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Mercer Island averages 5 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 156 sunny days per year in Mercer Island. The US average is 205 sunny days.
Mercer Island gets some kind of precipitation, on average, 153 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 76 degrees
Winter Low: the January low is 37
Rain: averages 39 inches of rain a year
Snow: averages 5 inches of snow a year