This fascinated me growing up, so perhaps is might also intrigue you: 

Rain is formed through the process of evaporation, condensation, and precipitation. It begins when the sun heats the Earth's surface, causing water from oceans, rivers, and lakes to evaporate into the atmosphere as water vapor. As the warm, moist air rises, it cools and condenses around tiny particles in the atmosphere, forming clouds. When the clouds become saturated, the water droplets combine and grow until they are heavy enough to fall as precipitation. This precipitation, in the form of rain, replenishes water sources, nourishes plants, and sustains life on Earth.