If your balcony receives full sun all afternoon, the material of your urban outdoor furniture is a critical factor. Many common outdoor furniture materials can indeed become uncomfortably hot—or even unsafe—to sit on under prolonged direct sunlight.
Metal furniture, especially aluminum or steel painted dark, absorbs heat rapidly. In full afternoon sun, a dark metal chair surface can reach temperatures of 120–140°F (49–60°C), which can burn skin on contact. Light-colored powder-coated aluminum or stainless steel with reflective surfaces is less absorbent but still may warm up.
Synthetic materials like resin wicker or plastic may feel hot to the touch but often have lower thermal conductivity, meaning they store less heat. However, dark-colored synthetic wicker can soften or warp under extreme heat.
Wood, particularly teak or cedar, is a natural insulator and remains cooler than metal. Yet dark-stained wood can absorb more heat, and bare wood may crack in intense sun over time.
Fabric cushions and upholstery should be checked: solution-dyed acrylic or polyester with UV protection stays cooler and resists fading. Foam-filled cushions may become uncomfortably warm without breathable covers.
To answer your direct question: Yes, certain materials can get too hot to sit on. For full afternoon sun, choose light-colored, heat-reflective metals, thick wood, or fabric with thermal-resistant padding. Adding a shade umbrella or having removable cushions is recommended to keep your seating comfortable.