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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.
According to the American Academy of Family Physicians, a fever is indicated when body temperature rises about one degree or more over the normal temperature of 37.0 degrees Celsius (98.6 degrees Fahrenheit). About This Image: Body temperature thermometer Adults: A fever is generally agreed to be present if: 1  Temperature in the mouth (oral) is at or over 37.7Â°C (99.9Â°F) 2  Temperature in the anus (rectum/rectal) is at or over 37.5 - 38.3Â°C (99.5 - 100.9Â°F) 3  Temperature under the arm (axillary) or in the ear (otic) is at or over 37.2Â°C (99.0Â°F)