Rain can potentially damage patio furniture, especially if it's not designed for moisture exposure. The extent of damage depends on the material, rain frequency, and care. Some materials resist rain better, like metal, certain plastics, and synthetic wicker. Natural materials like wood and wicker can swell and deteriorate. Rainwater can cause rust on metal parts. Cushions and fabrics may absorb water, leading to mold and odors. Protective finishes help, and covering furniture and maintenance prevent damage. To minimize rain-related damage, choose weather-resistant materials, use covers, store cushions indoors, and maintain your furniture.