What is temperature for adult conside being fever?

For adults, a fever is generally defined as a body temperature of 100.4°F (38°C) or higher. Normal body temperature typically ranges from about 97°F (36.1°C) to 98.6°F (37°C). A fever can be a sign of infection or illness, and its severity may depend on the underlying cause and duration. It's important to monitor other symptoms and consult a healthcare professional if necessary.