Water is lukewarm when it is slightly above your temperature, about 100-105 degrees F.
Perhaps about 75 or 80 degrees Lukewarm is generally around body heat. ≈ 36 oC or 98 oF
Not cold, not hot. Lukewarm. Between 90 and 160 degrees or so.
The degree for lukewarm temperature can vary, but it is typically around 90-98 degrees Fahrenheit (32-37 degrees Celsius). Lukewarm generally refers to a moderate or slightly warm temperature that is neither hot nor cold.
"Lukewarm" is a non-specific term, but if we consider room temperature to be 70 degrees, and bath water temperature to be 110 degrees, that is a 40 degree difference. Lukewarm should be about halfway between those two points. That would be 90 degrees, or about the same temperature as the average human's skin. So water on the skin at that temperature would feel "just a little bit warm". Which is what lukewarm means.
Body temperature is about 98oF or 36oC, so 71oF would not be too good a temperature for lukewarm water, it would be too cool but 71 ºC would be way to warm.
It means not too hot and not too cold, around 70-75 degrees F
You don't buy lukewarm water, you heat water until its lukewarm.
Just a little bit above cold, somewhere around body heat. Body heat is 98.6°F or 37.0°C. So lukewarm would fall roughly somewhere between 79 - 97 °F or 26 - 36°C.
lukewarm milk is milk heated up but not boiling hot just warm
The water in the bathtub was lukewarm.
The swimming pool's water was lukewarm.