Water vapour doesn't boil, but liquid water's boiling point is 100 degrees C, or 212 degrees F. boiling point is that point at which the vapour pressure of a liquid become equ … al to the atmospheric pressure at a particular temperature. for example boiling point of water is 100 degree Celsius that is at this temperature vapour pressure of water is equal to the atmospheric pressure so there is no boiling point of water vapour since it is not a liquid and boiling point is only determined ...