A cat's normal body temperature is between 38.5 and 39.5 degrees Celsius. Kittens have a higher body temperature than adult cats, and their body temperature is higher after exercise than when they are at rest. Generally, body temperature is measured rectally, as rectal temperature is more direct and accurate. When measuring body temperature, a mercury thermometer is used. It is inserted into the anus in a spiral shape, about one-third of the way in. The cat should remain still for 30 seconds to one minute. The cat needs to remain still and quiet. 
Solutions for a cat with high body temperature:
1. If the cat's highest body temperature does not exceed 0.5 degrees Celsius, it is recommended to use physical cooling methods, such as wiping the cat's paw pads, groin, and other areas with alcohol wipes.
2. If the cat's highest body temperature exceeds 1 degree Celsius, it needs to be taken to a veterinary hospital for an antipyretic injection. The medication usually takes effect 4 to 6 hours after administration.
