The normal temperature on a forehead should read 98.6 degrees Fahrenheit, according to MedicineNet. However, forehead thermometers are not very accurate, so the temperature taken via this method may vary by several degrees.
A normal body temperature is an average of 98.6 degrees Fahrenheit, but it may vary throughout the day, depending on the type of activity that one is doing. A healthy adult is not considered to have a fever until the body's temperature has risen above 100 degrees Fahrenheit orally, or 101 degrees Fahrenheit in the ear. According to WebMD, the best thermometers to use for accuracy are electronic oral thermometers and ear thermometers.