Metal surfaces in direct sunlight typically reach 130°F to 160°F, depending on the color of the metal, the ambient air temperature, and wind conditions. In extreme desert heat, researchers have recorded metal surface temperatures as high as 160°F in Adelaide, Australia and 144°F in a U.S. desert study where the air temperature was already 120°F. That’s hot enough to burn skin on contact.
Recorded Metal Temperatures in Studies
Researchers have measured sun-exposed metal surfaces across multiple climates, and the numbers are consistent enough to give a reliable range. A 2020 study in a desert climate (ambient air: 120°F, strong midday sun) recorded metal surfaces peaking at 144°F. An earlier study in Phoenix, Arizona found steel reaching 137°F to 140°F. And in Adelaide, Australia, where the air temperature was 111°F, metal surfaces climbed to nearly 161°F, the hottest of any material tested that day.
That Australian measurement is notable because metal actually outperformed asphalt, sand, and concrete in that study. Metal doesn’t always “win” this comparison, though. In the U.S. desert study, asphalt and porous rock both got significantly hotter than metal. The difference comes down to how each material absorbs, stores, and releases heat. Metal conducts heat very efficiently, which means it heats up fast but also loses heat to moving air faster than dense materials like asphalt.
What Makes the Biggest Difference
Three factors control how hot any piece of metal gets in the sun: color, wind, and cloud cover.
Color matters enormously. A black car’s exterior can exceed 170°F on a sunny day, while a white car under the same conditions stays closer to 120°F to 130°F. That 40 to 50 degree gap is entirely due to how much sunlight the surface reflects versus absorbs. Dark metals absorb most of the sun’s energy. Light or reflective metals bounce much of it back. This is the same principle behind “cool roof” coatings on metal roofing, which can shift a roof’s solar reflectance index from as low as 20 (bare dark metal) to as high as 90 (factory-coated reflective metal).
Wind is the other major player. Modeling data on exposed metal plates shows just how dramatic the effect is. On a clear, still day, a dry metal plate can climb nearly 48°C (about 86°F) above the ambient air temperature after four hours of sun exposure. Add a light breeze of just 1 meter per second (about 2 mph), and that rise drops to 37°C above ambient. At a moderate wind of 5 meters per second (about 11 mph), the rise shrinks to roughly 19°C, less than half the still-air number. Cloud cover cuts it further. On a cloudy day with moderate wind, metal may sit only 6°C above the surrounding air temperature.
If the metal is wet, the cooling effect is even more dramatic. Evaporative cooling can keep metal surfaces below ambient air temperature for the first couple hours after sunrise, and any significant breeze on a wet surface prevents meaningful temperature rise altogether.
How Hot Is Hot Enough to Burn?
Skin burns happen faster than most people expect. At 140°F, a burn can occur in about five seconds of sustained contact. At 160°F, it takes roughly one second. Children are more vulnerable because their skin is thinner, and because they may not react as quickly when something feels hot.
This is why playground safety has shifted away from bare metal equipment. The Consumer Product Safety Commission notes that uncoated metal slides can cause severe burns, which is why many have been replaced with plastic or coated with heat-reducing paint. Metal playground equipment where the coating has worn away is a particular hazard. A simple touch test before letting a child play is the most practical precaution: if the surface feels hot to your adult hand, it’s too hot for a child’s bare skin.
Common Metal Objects and What to Expect
Car exteriors are among the most common hot-metal encounters. On a typical summer day, the cabin of a black car can reach 130°F to 160°F within an hour, while exterior body panels can exceed 170°F. Seatbelt buckles, steering wheels with metal trim, and exposed metal parts inside the cabin follow similar patterns. White and silver cars run 10 to 20 degrees cooler inside, which is meaningful but still plenty hot.
Metal handrails, fence posts, and outdoor furniture follow the same physics. A dark-painted iron railing in full sun on a 95°F day can easily reach 140°F or more. Aluminum bleachers at a sports field, metal park benches, and steel utility covers on sidewalks all fall in similar territory. The objects people are most likely to touch with bare skin (railings, slides, car parts) are exactly the ones that pose the greatest practical risk.
Metal roofing sits at the high end of everyday exposure because roofs get unobstructed sun for hours. An uncoated dark metal roof can easily exceed 160°F on a hot day, while a reflective-coated metal roof might stay 40 to 60 degrees cooler. For anyone working on a roof or in an attic, that coating difference translates directly into both surface burn risk and how much heat transfers into the building below.
Shade Changes Everything
Metal in the shade stays close to the ambient air temperature. Because metal conducts heat so well, it both heats and cools quickly compared to materials like concrete or brick, which retain heat for hours. Move a metal chair from full sun into shade, and within 10 to 15 minutes it will feel noticeably cooler. The same piece of concrete would stay hot much longer. This rapid response to shade is actually one of metal’s advantages: the problem is intense but relatively short-lived once the sun exposure ends.