Average monthly wind speed in Mercer Island (WA)

Here you can view the typical wind conditions throughout the year in Mercer Island, (Washington State), the United States of America.

The average annual wind speed in Mercer Island spans from 4 m/s (8 knots) to 5 m/s (10 knots).

In February, April, May, June, July, August, September, October, November and December you will have an average wind speed of 4 m/s (8 knots), indicating a noticeable breeze on most days. Daily variations can range from very light winds to stronger gusts. On an average day with 4 m/s (8 knots), small tree branches sway steadily. This speed is equivalent to 14.4 kilometers per hour or 8.9 miles per hour. While the climate generally allows for outdoor activities, occasional gusts may affect activities such as ball games. It can also produce white-capped waves over water.

However, January and March experiences average wind speeds of [5 m/s]. This means most days feature persistent breezes that cause large branches to sway and dust to blow around. The wind creates noticeable resistance. This speed translates to 18 kilometers per hour or 11.2 miles per hour. While intensity may vary at times, consistently windy weather is typical during this period. It's an ideal time for kite and windsurfing enthusiasts.

For more detailed information about Mercer Island’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Mercer Island climate page.