Good quality salmon can be cooked to medium rare. We grill salmon until the internal temperature of the salmon in the thickest part reaches 125 degrees Fahrenheit. Carry over cooking will continue and cook it to about 130 - 135 degrees Fahrenheit. Use a good instant read meat thermometer like the Thermoworks Thermapen One or ThermoPop for the best salmon. The less fat in the salmon, the more quickly it will cook. So be sure to account for your timing based on what type of salmon you buy.