Average monthly wind speed in Belfast

On this page you will find more information about the mean monthly wind speed over the year in Belfast (County Antrim), Ireland.

Wind speed in Belfast varies across the year, ranging from 4 m/s (8 knots) to 5 m/s (10 knots).

During April, May, June, July, August and September, wind speed averages 4 m/s (8 knots), creating notably breezy conditions. Daily fluctuations span from gentle winds to more substantial gusts. At the average speed of 4 m/s (8 knots), small tree branches show continuous swaying motion. This wind strength equals 14.4 kilometers per hour or 8.9 miles per hour. Most plans remain feasible, though some days bring conditions strong enough to affect certain sports.

Wind speeds average 5 m/s (10 knots) during January, February, March, October, November and December, 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 Belfast’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Belfast climate page.