The coldest planet of our solar system is curiously Uranus, the 7th planet, and not Neptune, the 8th planet. With temperatures dropping to -218°C in Neptune’s upper atmosphere, the planet is the second coldest in our solar system. Despite being a billion miles closer to the Sun than Neptune, Uranus has a lowest recorded temperature of -224°C.
The seventh planet from the sun, Uranus has the coldest atmosphere of any of the planets in the solar system, even though it is not the most distant. Despite the fact that its equator faces away from the sun, the temperature distribution on Uranus is much like other planets, with a warmer equator and cooler poles.