Rain comes from water that evaporates from Earth's surface—mainly from oceans, seas, lakes, rivers, soil, and plants—due to the heat of the Sun. This water turns into water vapor, a gas, which rises into the atmosphere. As the water vapor rises, it cools and condenses back into tiny water droplets, forming clouds. When these droplets combine and grow large enough that they become too heavy to stay suspended in the cloud, they fall to the ground as rain

. This process is part of the water cycle, where water continuously moves from the surface to the atmosphere and back again. Moisture sources vary by location, with oceans being the largest contributor globally, while plant transpiration and soil evaporation contribute significantly over land

. Additionally, rain formation is influenced by atmospheric conditions such as low-pressure systems, weather fronts, and geographical features like mountains, which can force moist air to rise and cool, enhancing condensation and precipitation

. In summary, rain originates from evaporated water that condenses in the atmosphere and falls when droplets become heavy enough, driven by the Sun's heat and atmospheric dynamics