Interesting fact: Wind is not a different substance from air. It is simply air in motion, which is why calm air and windy air have essentially the same mass per volume.
The answer: Wind weighs the same as air occupying the same volume. Near sea level, 1 cubic meter of wind weighs about 1.2 kilograms, although temperature, humidity, and pressure can shift that number slightly.
What makes wind feel powerful is speed, not extra mass. Measuring its weight is tricky because the important part is usually momentum and pressure, not a fixed block of moving air. Engineers and meteorologists care about wind mass because it influences turbine performance, storm loading on buildings, aircraft behavior, and the transport of heat, moisture, and pollution.
