Yes, urban outdoor furniture can often be left outside during the rainy season without rusting, but it really depends on what the furniture is made of and how well it is maintained. If you have powder-coated aluminum, stainless steel, high-quality teak, or HDPE furniture, it is usually designed to handle wet weather. These materials either resist rust naturally or use coatings and hardware that protect them from moisture. On the other hand, cheaper mild steel, wrought iron with worn paint, or furniture with exposed screws and joints can start rusting quickly once water sits on the surface.
In a city, rain can be a little tougher on outdoor furniture because pollution, dirt, and standing water can speed up corrosion and staining. The biggest risks are not just the rain itself, but water trapped in joints, scratches in the coating, and furniture left in puddles for days. To protect urban outdoor furniture, choose pieces with good drainage, slightly elevate the legs, keep covers ventilated rather than sealed tightly, and dry surfaces before covering them for long periods. Cushions and fabric should usually be brought inside or stored in a dry place.
So the honest answer is: yes, many urban outdoor furniture pieces can stay outside in the rainy season without rusting, but not all. Check the material, inspect the finish, and do a little maintenance before and after the rainy season. If the furniture is rust-resistant and cared for properly, it should hold up well. If it is budget steel furniture with weak coating, it is safer to store it or protect it carefully.