It is hard to accurately determine the high and low temperatures on Saturn, as it is made of three bands of gas clouds instead of solid ground. The innermost band is thought to be approximately 134 degrees Fahrenheit, while the outer band is estimated to be -280 degrees.
The reason for these differences in temperature is that Saturn receives little to no heat from the sun. Instead, the majority of the planet's heat radiates out from within its core. Saturn has a horizontal temperature gradient, as opposed to Earth's vertical gradient. The horizontal gradient also means that there is only a minor temperature difference between Saturn's equator and poles.