Great question—this is one of those details that makes a huge difference in comfort. I’ve dealt with enough scorching hot benches to keep my answer practical.
First, material matters more than anything. A solid steel, iron, or dark aluminum bench will absorb heat and can easily become too hot to touch in direct summer sun. Dark plastics and dark composite materials can also get surprisingly hot. The benches that stay the most comfortable are usually made from natural wood. Teak, cedar, white oak, and cypress are good choices because wood has lower thermal conductivity than metal, so it does not transfer heat into your skin as aggressively. Light-colored or weathered wood stays even cooler than dark stained wood.
If you want something nearly maintenance-free, look at high-quality recycled plastic lumber, often called HDPE or poly lumber. It is used in a lot of commercial park benches. Choose light colors like sand, driftwood, white, or light gray. The lighter pigments reflect more solar energy, and poly lumber does not get as brutally hot as metal. It also will not splinter, rot, or need painting.
If you prefer the look of metal, go with light-colored powder-coated aluminum rather than steel or iron. Aluminum heats up but also cools down faster. Look for seats with slats or perforations because gaps allow air circulation and let heat escape. A solid sheet of metal will always feel hotter than slatted or mesh seating.
A few design details help too. Slatted wood or recycled plastic seats naturally stay cooler because air can move beneath them. Color matters a lot: lighter colors can be 20 to 30 degrees cooler than dark ones in full sun. And if you can place the bench under a tree, pergola, or shade sail, that is the most effective fix.
So my suggestion for a park bench that stays cool? A teak or light-colored recycled plastic bench with a slatted seat, or a powder-coated aluminum bench with a perforated or slatted seat in a light color. Avoid unpainted steel, wrought iron, and dark plastic. If you are buying for a park or public space, look for commercial-grade versions with UV-stabilized materials, because they are engineered for all-day sun exposure without fading or becoming too hot.
That should keep you from doing the “hot bench hop” this summer.