This study examines the effects of an immersive virtual reality scenario on participants’ risk perception and flood-related self-efficacy as well as its effects on the act of taking precautionary measures for floods. In the short term, a significant increase in risk perception and flood-related self-efficacy was observed following the intervention, which is likely explained by cognitive biases, such as the availability heuristic. Participants perceived the risk of flooding more realistically, supported by the increased availability of information in their memory. The risk perception and self-efficacy measures did not decline significantly after a three-month interval with participants still perceiving an enhanced ability to cope with flood events. These results suggest that the VR scenario has a sustainable impact on both risk perception and self-efficacy. Moreover, mixed effects were observed regarding specific precautionary measures, indicating limitations in the data collection methodology. Overall, the study demonstrates the potential of VR as an effective tool in disaster training and highlights the importance of immersive, gamified learning methods for disaster preparedness.