No, Jupiter is not the coldest planet in our solar system. While it is a gas giant and has a very low average temperature, the title of the coldest planet belongs to Neptune.
Jupiter’s average temperature is around -145 degrees Celsius (-234 degrees Fahrenheit) in its upper atmosphere. However, it has a very large warm interior, resulting from the immense pressure at its core, which leads to higher temperatures deep within the planet.
On the other hand, Neptune, which is further from the Sun than Jupiter, has recorded temperatures as low as -214 degrees Celsius (-353 degrees Fahrenheit). This is due to its thick atmosphere and significant distance from the Sun, making it colder than Jupiter.