It depends on which part of the space we are talking about. In general, it works like this: the closer to the stars, the higher the temperature. Another factor that weighs is the presence of matter: heat can be retained by it. As space becomes empty, temperature drops. In a vacuum (absence of matter), the temperature drops to 2.7 Kelvin or -270.45 Celsius. Only a few degrees above absolute zero (-273.15 °C).
There is no place colder than space. It has a lot of empty regions distant from heated bodies. The lowest temperature ever recorded on Earth was -89.2 ºC, in Antarctica. In interstellar space, where there is no absolute void (there are gases and dust grains), the temperature varies.
At the Earth’s thermosphere, where the atmosphere turns into space, the exact temperature can also vary substantially. However, the average temperature above 300 km is about 427 degrees Celsius at solar minimum and 927 degrees Celsius at solar maximum. But this does not mean that the space above the atmosphere is at this temperature. In fact, it is very cold. Only a body in this region that is illuminated by the sun can reach this temperature. In the dark areas of space, temperatures would drop a lot.
On the Moon, which has no atmosphere, temperatures vary a lot. When sunlight reaches the moon’s surface, the temperature can reach 127 degrees Celsius. However, when the sun goes down, temperatures can drop to – 173 degrees Celsius.
Credit : Curiosity Guide
Picture Credit : Google