I recommend cooking filet mignon to a medium-rare temperature, or about 130-135 degrees Fahrenheit (54-57 degrees Celsius). If you like your steak more towards medium, you can cook it up to 145 degrees. For a cut like filet mignon though, I really wouldn’t go higher than that—there’s something magical about that pink-red middle that is oh-so-tender. If you prefer your steaks well done, save your money and buy a cheaper cut of steak! Also, keep in mind that steak will continue to rise in temperature about 3 degrees after being removed from the pan or the oven.