Our Solar System

Ranked · Updated October 2026

Hottest Planets in the Solar System (Ranked).

Distance from the Sun is not the same as temperature. Atmospheric thickness and composition matter just as much. Ranked by mean surface temperature, or for the giant planets the temperature at the 1-bar level near their cloud tops, here is the order.

  1. Venus ~464 °C surface. Runaway greenhouse, 92-bar CO₂ atmosphere. Hotter than Mercury despite being further from the Sun.
  2. Mercury 167 °C mean. Up to 430 °C dayside, but down to −180 °C at night. No atmosphere to retain heat.
  3. Earth ~15 °C global mean. The Goldilocks case.
  4. Mars About −60 °C average. Thin atmosphere lets heat escape almost as fast as it arrives.
  5. Jupiter −108 °C at the 1-bar level. Internal heat raises the deeper layers significantly.
  6. Saturn −139 °C at the 1-bar level.
  7. Uranus −197 °C at the 1-bar level, a little warmer than Neptune there, though higher up its atmosphere dips to −224 °C, the coldest of any planet.
  8. Neptune −201 °C at the 1-bar level.

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