Is 98°F a Fever? Understanding Normal Body Temperature Ranges

Normal Temperature Range

The average oral temperature is 98.6°F (37°C), but normal varies:

• 97°F – 99°F (36.1°C – 37.2°C) for most adults
• Lower in the morning, higher in late afternoon
• Rectal/ear readings run ~0.5–1°F higher; axillary (armpit) runs lower

Is 98°F High?

No. 98°F (36.7°C) falls well within the normal range. It is not considered a fever.

When to Worry

• Low-grade fever: 99.1°F – 100.4°F (37.3°C – 38°C)
• Fever: ≥100.4°F (38°C)
• Seek care if fever persists >3 days, exceeds 103°F (39.4°C), or accompanies severe symptoms.