What body temperature is too high? When your body temperature reaches 103 or more, then it is too  high. This indicates that there is a fever and a person should seek  medical attention, especially if it has … been more than three days.ow high can the temperature be before you die?   Hyperpyrexia is an excessive and unusual elevation of set body temperature greater than or equal to 41.1 °C (106 °F), or extremely high fever.