Weather Forecast and Radar for Mercer Island, Washington

Weather in Mercer Island, WA

Mercer Island, Washington, United States has a temperate climate with warm summers and mild winters. In the summer months, July and August are the warmest, with temperatures reaching up to an average high of 78°F (26°C). During the winter months, December and January are the coldest, with temperatures reaching an average low of 36°F (2°C). The spring months of March and April are the wettest, with an average of 3 to 4 inches of rainfall per month. The fall months of September and October are the driest, with an average of less than 1 inch of rainfall per month. Snowfall is relatively rare in this area, but can occur in the winter months, typically in the form of light snow showers. Overall, the climate in Mercer Island is generally mild and pleasant year-round.

Fast Facts About Mercer Island, WA

As of 2020, the city population is 25820.

Major Cities Nearby Mercer Island, WA

This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Mercer Island, Washington.