Welcome to today's Ask Jack chat. Jack and the weather team are ready to take your questions. If the air is right at the ground, dew forms. The condensing water forms tiny fog drops a few inches or a few feet above the ground. Higher in the air the condensing water forms the tiny drops we see as a cloud.
Humidity is a measure of the amount of water vapor - an invisible gas.
Liquid water, such as rain, is not humidity. Eventually, many clouds will begin to produce rain, which will fall into the drier air below the cloud. That is, the air below the cloud has a humidity less than 100 percent. Some of the water in the falling rain evaporates into the drier air below the cloud, which increases the humidity of that air. But, unless the air is already very humid, it won't increase it to 100 percent.