Normal feline temperature sits roughly between 38.0 and 39.2 degrees Celsius, higher than ours, so feeling warm to the touch does not mean fever.
Nose moisture varies with environment and licking and cannot judge temperature; hot ear tips are only a vague hint, and a thermometer is what confirms.
Rectal measurement is the clinical standard and needs lubrication, gentleness, and a helper at home; ear and forehead guns carry large errors in cats.
Above about 39.5 with dullness or poor appetite, see a vet; below 37.5 is equally dangerous, as both heatstroke and hypothermia are emergencies.
