What is a high temperature for an 8 year old?

A high temperature for an 8-year-old is generally considered to be 100.4°F (38°C) or higher when measured with a rectal thermometer. For oral measurements, a temperature above 100°F (37.8°C) may also indicate a fever. It's important to monitor other symptoms and consult a healthcare provider if the fever persists or is accompanied by concerning signs.