The short answer is yes, dark-colored urban outdoor furniture can become uncomfortably hot when placed in direct sunlight. This is due to a basic principle of physics: darker surfaces absorb more solar radiation (including visible light and infrared heat) than lighter ones, which reflect more of this energy. In an urban setting, where concrete and asphalt already contribute to the "heat island" effect, a dark metal or plastic chair can quickly reach temperatures high enough to cause discomfort or even minor burns.
However, the extent of heating depends heavily on the material. Dark anodized aluminum or powder-coated metal heats up rapidly and retains heat. Traditional dark woods like teak absorb heat but may feel less intense due to their lower thermal conductivity. Some modern synthetic resins are designed to be heat-resistant, but a dark hue will still make them warmer than a light version.
To mitigate the heat, consider strategic placement in shaded areas, using light-colored cushions or covers, and opting for materials with lower heat conductivity like thick wood or certain composites. For sunny urban balconies and patios, lighter colors are generally a more practical choice for comfort. Ultimately, while dark furniture offers a sleek, modern aesthetic, its practicality in full sun is limited by its tendency to absorb significant heat, making material and placement key factors for year-round usability.