Venus has a mean surface temperature of 867°F (464°C), making it the hottest planet in our solar system. That’s hot enough to melt lead and zinc, and it stays nearly that hot whether you’re on the sunlit side or in total darkness. Despite being farther from the Sun than Mercury, Venus is roughly 500°F hotter thanks to the most extreme greenhouse effect in our solar system.
Surface Temperature and What It Means
NASA puts the average surface temperature at around 867°F (464°C), though measurements from various missions have recorded readings up to about 900°F (475°C) depending on location and altitude. To put that in perspective, lead melts at 621°F and zinc at 787°F. Both metals would exist as liquids on the Venusian surface. Your kitchen oven maxes out around 500°F. Venus runs nearly twice that, constantly, everywhere on the planet.
One of the strangest things about Venus is how uniform that heat is. Most planets cool significantly on their night side, but Venus barely does. The temperature at the surface is nearly identical whether it’s facing the Sun or turned away from it. This is entirely because of the atmosphere, which holds and distributes heat so effectively that location and time of day are almost irrelevant.
Why Venus Is Hotter Than Mercury
Mercury orbits much closer to the Sun, yet its mean temperature is only 333°F (167°C), less than half of what Venus reaches. The reason is simple: Mercury has virtually no atmosphere. Sunlight heats its surface, but that heat radiates back into space with nothing to trap it. Mercury’s night side drops to hundreds of degrees below zero.
Venus, on the other hand, is wrapped in an incredibly dense atmosphere made almost entirely of carbon dioxide. When sunlight reaches the planet’s surface, the ground absorbs it and re-emits the energy as infrared radiation (heat). Carbon dioxide molecules absorb that infrared energy, vibrate, and radiate it back in all directions. About half escapes toward space, and about half returns toward the surface. With an atmosphere that thick and that rich in heat-trapping gas, this cycle runs continuously, piling heat on top of heat with almost no way for it to escape. This is the same greenhouse mechanism that warms Earth, just pushed to an extreme.
The Crushing Atmosphere
Temperature is only part of what makes Venus so hostile. The atmospheric pressure at the surface is more than 75 times what you experience at sea level on Earth. That’s equivalent to the pressure you’d feel 2,550 feet deep in the ocean. This massive blanket of gas doesn’t just trap heat; it acts like an insulating layer that keeps temperatures locked in place, preventing any significant cooling at night or at the poles.
The combination of pressure and temperature is what destroyed every spacecraft ever sent to the surface. The Soviet Venera landers, which remain the only missions to successfully touch down on Venus, survived two hours or less before their electronics failed. No lander has operated on the surface since the 1980s, largely because the conditions are so punishing that even hardened engineering can’t hold up for long.
Cooler Temperatures Higher Up
The surface is brutal, but Venus gets surprisingly mild at altitude. About 30 miles (50 kilometers) above the surface, temperatures drop to between 86°F and 158°F (30°C to 70°C), and the atmospheric pressure is close to what you’d find on Earth’s surface. NASA has noted that this temperature range could theoretically support certain forms of Earthly life, like heat-tolerant microbes. This high-altitude zone is one reason scientists have discussed the idea of floating research platforms in Venus’s atmosphere, even though the surface remains completely inhospitable.
How Venus Compares to Other Planets
To see how extreme Venus really is, consider the full range of planetary temperatures in our solar system. Mercury averages 333°F, Earth about 59°F, and Mars around minus 85°F. The outer gas giants are colder still, with Neptune bottoming out near minus 330°F. Venus sits so far above everything else that it’s in a category of its own. No other rocky planet comes close, and even the upper atmospheres of gas giants don’t sustain surface-level heat like Venus does.
The lesson Venus teaches planetary scientists is that distance from the Sun isn’t destiny. Atmospheric composition matters enormously. A planet with the right mix of heat-trapping gases can end up far hotter than one that’s physically closer to its star, and once a runaway greenhouse effect takes hold, there’s no obvious mechanism to reverse it.