How-to Test Grill Temperatures
For a covered grill, have the cover down on the grill and open the vent slightly. Insert a grill thermometer through the vent. For an uncovered grill, check the temperature by cautiously holding the palm of your hand 3 to 4 in. above the grate. Count the number of seconds you can hold your hand in that position before the heat forces you to pull it away. Use the chart below as a guideline.