Answer:
The average temperature on Venus is about 464 °C (867°F).
It is this hot because it is the second planet from the sun, and has what scientists call a 'runaway greenhouse' effect. A thick layer of clouds (carbon dioxide and some sulphuric acid) covers the surface and traps infrared radiation, raising the surface temperature of the planet.
The movement of the atmosphere gives the entire planet a nearly uniform temperature all year long, even at the poles and even at night.