Ranked · Updated May 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 or cloud-top temperature, here is the order.

1. Venus ~465 °C surface. Runaway greenhouse, 92-bar CO₂ atmosphere. Hotter than Mercury despite being further from the Sun.
2. Mercury 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 −63 °C average. Thin atmosphere lets heat escape almost as fast as it arrives.
5. Jupiter −108 °C cloud tops. Internal heat raises the deeper layers significantly.
6. Saturn −138 °C cloud tops.
7. Uranus −197 °C cloud tops. Coldest planetary atmosphere despite being closer to the Sun than Neptune.
8. Neptune −201 °C cloud tops.

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