medium beef tenderloin temperature
Insert a meat thermometer into the center of the tenderloin. For a 2 1/2 to 3 lb. tenderloin, a meat thermometer should read 145 F for medium-well. For the same size tenderloin, medium-well should take roughly 40 to 45 minutes. Remove the beef tenderloin from the oven and let it rest for about 10 minutes before eating.