Average monthly wind speed in SeaTac (WA)

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

These figures come from monthly climatological averages showing that SeaTac sees peak wind speeds of 5 m/s (10 knots) during its windiest period and minimum speeds of 4 m/s (8 knots) during its calmest season.

The 4 m/s (8 knots) average in February, April, May, June, July, August, September, October, November and December means SeaTac experiences consistent moderate winds. Conditions vary from calm periods around to more active episodes throughout the month. At typical wind levels, smaller trees show steady branch movement. In common units, 4 m/s (8 knots) equals 14.4 km/h or 8.9 mph. While generally comfortable for most activities, occasional windy days may affect your plans and can make the air feel cooler.

Wind speeds average 5 m/s (10 knots) during January and March, making these the windiest months of the year. Most days bring strong winds that can sway small trees and make walking more challenging. Umbrellas are difficult to manage. The average speed of 5 m/s equals 18 km/h or 11.2 mph. While calmer intervals or stronger gusts may occur, breezy conditions are typical throughout this period. It's generally a great time for flying a kite or going windsurfing.

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