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The normal temperature inside your childâs body is usually around 37 degrees Celsius. Your child has a mild fever if their temperature is higher than 38 degrees Celsius. A high fever usually means more than 39 degrees Celsius.
Overview, Causes, & Risk Factors. Fever is a higher-than-normal body temperature. Normal temperature is usually defined as 98.6 degrees Fahrenheit (F) or 37 degrees Celsius (C).Many healthcare providers would say a person truly has a fever when their temperature is greater than 99.5 degrees F or 37.5 degrees C.ormal temperature is usually defined as 98.6 degrees Fahrenheit (F) or 37 degrees Celsius (C). Many healthcare providers would say a person truly has a fever when their temperature is greater than 99.5 degrees F or 37.5 degrees C.