Just like humans, cats have physiological needs, including maintaining an optimal body temperature. The normal cat temperature range is 100.4°F to 102.5°F (38°C to 39.2°C). Any deviation from these may indicate illnesses or underlying health conditions. Rectal thermometry is the most commonly used and relatively accurate method for measuring a cat's temperature. While generally abnormal body temperature may indicate fever or hypothermia, it may also indicate other causes.