Is 99.9 considered a temperature

Answer 1

Although temperature is never properly expressed as a unitless quantity, it is not uncommon in the United States to say something like "You have a temperature of 99.9" which is slang for "You have a core body temperature of 99.9 degrees Fahrenheit."

Answer 2

98.6 is usual. Fevers should be diagnosed by doctors.

Answer 3

Not without a qualification added to indicate a temperature scale.

Answer 4

It can be. In the Celsius scale this is almost boiling