I feel you on this one—there's nothing worse than walking up to a bench on a sunny day and immediately jumping back up because it feels like a skillet. I’ve dealt with the same frustration in a community project, and after a lot of trial and error, we finally landed on a few materials that genuinely make a difference. The short answer is: yes, there absolutely are specific materials that stay cooler, and it boils down to thermal conductivity, reflectivity, and structure.
The absolute champion in my experience is high-density polyethylene (HDPE) lumber, the recycled plastic “wood” used by brands like POLYWOOD or Trex Outdoor Furniture. I know plastic sounds counterintuitive, but HDPE is nothing like the hollow resin chairs that warp in the sun. It’s dense, solid, and has extremely low thermal conductivity—meaning it doesn’t eagerly pull heat from your body or the sun the way metal does. Even on a 95°F day, you can sit on an HDPE bench in direct sunlight without that sharp “ouch” feeling. It does get warm, but it dissipates heat quickly and never reaches the tissue-damaging temperatures of steel or aluminum. We placed a dark bronze HDPE bench in a playground that previously had a powder-coated steel bench, and the difference was night and day both in comfort and actual surface temperature. The maintenance-free aspect is a huge bonus too.
If plastic lumber doesn’t fit your aesthetic, your next best bet is thermally modified wood or dense, light-colored hardwoods like teak or white oak that are specifically designed for outdoor use. Thermal modification bakes the wood at high temperatures in an oxygen-free environment, which not only makes it rot-resistant but also changes its cellular structure to feel less “heat-greedy.” It tends to stay cooler than dense tropical woods like ipe, which can still get warm but remain manageable compared to metal. The trick with any wood is color: a light, natural finish will reflect more heat. If you can, avoid dark stains that absorb infrared. We’ve had good success with thermally modified ash benches with a light gray weathered patina—they stay remarkably temperate even at midday.
Now, you might be thinking, “Can I just keep my existing metal bench and make it cooler?” Metal is tricky because aluminum and steel have high thermal conductivity; they suck up solar radiation and transfer that heat to you instantly. However, if you must use metal because of durability or design constraints, look for perforated or heavily slatted aluminum with a light-colored, matte powder coat. The holes and gaps allow air circulation underneath, so the surface doesn’t hold heat as aggressively. A solid cast metal bench with a dark finish is the worst-case scenario—it’s basically a heat battery. One workaround we used for a memorial bench that had to be cast iron was adding a simple slatted wood seat top retroactively; it kept the historical look but made it usable in summer.
Beyond material choice, passive shading is your best friend. Even the coolest material will struggle if it’s blasted by the full sun from noon to 4 p.m. If relocation is an option, move the bench to a morning-sun/afternoon-shade spot. If not, consider planting a deciduous tree nearby or adding a pergola overhead. The combination of HDPE and dappled shade from a honey locust tree has kept our courtyard benches so pleasant that people now linger there with coffee instead of avoiding them entirely.
One material that often gets suggested but I’d caution against is concrete. It has low thermal conductivity, so it stays cool to the touch longer than metal, but once it’s been in the sun all day, it stores an incredible amount of heat and slowly releases it well into the evening. A concrete bench can actually be hotter to sit on at 6 p.m. than at noon because it’s been baking for hours. Not ideal unless it’s permanently shaded.
Here’s the core takeaway if you want to make a quick, confident decision: take a look at HDPE lumber benches in a color like weathered wood, light gray, or white. They’re practically the gold standard for hot climates right now—no splintering, no sealing, and they simply don’t burn. Pair that with smart placement, and you’ll solve the scorching bench problem for good. It’s genuinely one of those small infrastructure shifts that makes public or backyard spaces feel worlds more inviting.