Earth's atmosphere reaches record high for water vapor

Earth’s atmosphere reached a record high for precipitable water in August, according to data from the Copernicus Climate Change Service (C3S). The average amount of water vapor in the atmosphere was measured at 27.35 kilograms per square meter, the highest value recorded since monitoring began in 1979.

This figure exceeds the previous record set in July 2024 by 0.04 kg/m², which represents approximately 20 trillion additional liters of water distributed globally throughout the atmosphere. Precipitable water refers to the total amount of water vapor contained in a column of air extending from the surface to the upper layers of the atmosphere.

Scientists note that water vapor acts as a powerful greenhouse gas. As global temperatures rise, warmer air can hold more moisture; specifically, for every degree Celsius of warming, the air can hold approximately 7% more water vapor. This increased moisture can fuel storm systems and contribute to more intense rainfall, as the condensation of rising water vapor releases heat energy into the atmosphere.