Short answer: yes, it can absolutely get too hot to sit on comfortably in summer, especially if it is a solid, dark metal bench sitting in full sun. On a 90–100°F day, dark steel or aluminum panels can reach 140°F to 170°F. At those surface temperatures, bare skin can feel pain within seconds, and prolonged contact can even cause a mild burn.
But the metal itself is only part of the story. Color matters a lot: light-colored or unpainted brushed metal reflects more solar energy and stays noticeably cooler than dark paint. Surface finish also plays a role. A light powder-coated texture will not absorb as much heat as smooth black paint. Perforated or expanded metal benches also behave better because air moves through the holes and the surface cools faster than a solid slab. A solid dark metal plate in direct sun is basically a heat trap.
Shade and time of day are just as important. A bench that gets morning sun but afternoon shade may feel fine by the time people actually sit on it. A bench on a west-facing concrete plaza with no trees can stay hot into the evening because the metal and the pavement both radiate heat.
So if you are asking whether the metal on this urban bench will become too hot: check the color, whether it is solid or perforated, and whether it gets shade during the hottest part of the day. If it is dark, solid, and exposed to full afternoon sun, I would treat it like a car hood in summer. Test it with the back of your hand before sitting, or put down a jacket, bag, or newspaper first. With light colors, open mesh, or good shade, a metal bench can be perfectly comfortable even in July.