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Wind is air in motion. Wind forms when the sun heats one part of the atmosphere differently than another part. This causes expansion of warmer air, making less pressure where it is warm than where it is cooler.
When we fan ourselves, we make the air move and it is felt as wind. What makes air move during windy weather? This is because of unequal heating, temperatures at different places are not the same. As the warmer air expands, the density and pressure of air decrease. The surrounding cooler air flows in to fill the void and wind develops. In Hong Kong, windy weather is usually caused by monsoon or tropical cyclone.