What Is Saturn's Night Temperature?

Mostly made up of molecules of Hydrogen and helium there is very much less solid ground on planet Saturn. The yellow color of Saturn, as taken by Voyager, is because of presence of sulphur in it.
Temperature of Saturn at different places can vary just as on other planets.
At different places, Saturn's temperature might vary a bit.
Saturn's night temperature can fall between -140 C to -170 C maximum.
Also take a look at Saturn's Images.
Also visit:
Blurtit Reference:What's the temperature on Saturn?   
Blurtit Reference:What Is The Temperature In The Daytime On Saturn?

About 300 Celsius

It is 45 degrees. Because it is far away from the sun.

I think nearly 150 or 300 degree celcius.