A method for hydrocarbon resource recovery in a subterranean formation includes forming a laterally extending injector well in the subterranean formation and forming a laterally extending producer well spaced below the injector well. The method may also include radio frequency (RF) heating the subterranean formation to establish hydraulic communication between the injector well and the producer well. The method may further include injecting heated liquid water into the injector well to recover hydrocarbon resources from the producer well based upon the hydraulic communication therebetween.