Average Bathwater should be between 101Â°F or 38Â°C to 106Â°F or 41Â°C. Considering that the average body temp of a man is 98.6Â°F or 37Â°C. then the average bath water shoul â¦ d be between 101Â°F or 38Â°C and 106Â°F or 41Â°C. As a young male Caucasian 18 year old, I used to go to a Country Club Type Spa and they had what they called a Mineral bath.