The temperature of the Earth's mantle can vary significantly depending on the depth. The upper mantle, near the crust, can reach temperatures between 1,000 and 1,300 degrees Celsius (1,832 to 2,372 degrees Fahrenheit). Deeper sections of the mantle can be much hotter, with the deepest parts of the lower mantle reaching temperatures of up to 3,700 degrees Celsius (6,692 degrees Fahrenheit).