Literal meaning that weather is unpredictable; used to mean that human life is full of sudden changes or misfortunes. First half of a couplet, usually followed by [[人有旦夕祸福|人有旦夕禍福|ren2 you3 dan4 xi1 huo4 fu2]]

Fortune is as unpredictable as the weather, and every day may bring luck or disaster; used to express that something unexpected may happen at any moment.