We don't think of clouds even having weight because they are floating. But, clouds are made up of a physical substance, water, and water is quite heavy, so clouds must have weight.

Is a cloud heavy or light?

They may look all light and fluffy, but the reality is that clouds are actually pretty heavy. Researchers have calculated that the average cumulus cloud - which is that nice, white fluffy kind you see on a sunny day - weighs an incredible 500,000 kg (or 1.1 million pounds!).

How do they weight clouds?

Finding the Weight of a Cloud

Clouds form when the temperature becomes too cold for the air to hold water vapor. The vapor condenses into tiny droplets. Scientists have measured the density of a cumulus cloud at about 0.5 grams per cubic meter.