How Cold Is the Planet Neptune and Why Is Neptune About the Same Temperature As Uranus?

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Karen Hill

Neptune is over 1 billion miles (1.6 billion km) farther away from the Sun than Uranus, but the two planets are close in temperature: –365°F (-220°C) on Neptune; –355°F (-214°C) on Uranus.

This results from Neptune’s interior, which is not as solid as Uranus’s.

A partially fluid core will experience more movement than a solid core, and movement, friction, creates heat.

While Neptune is not hotter than Uranus, it is much warmer than expected, given its distance from the Sun.

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