Not wishing to seem unreasonably scientific, but it depends on the person (and, as a rule, the time of day/the month, how much sleep they've had in the last fortnight, what they've been eating recently, ...). The 'normal' human range is about 35.5 to 37.5 C (~96 to 99.5 F), although most people are towards the middle of the range almost all the time. If my temperature is 36.9 C, I take paracetamol and go to bed.