The present invention relates to an apparatus and method for changing alarm information based on weather, and more particularly to an apparatus and method for changing alarm information based on weather, which can collect locations, time and weather information for a path, routinely used by a user, and a destination and actively adjust alarm time based on a weather condition, which can measure the gap between a weather forecast and real-time observation data, determine whether a gap notification condition has been satisfied and provide notification to a user, and which can collect location information and weather information via a report message, determine the urgency level of a disaster situation and generate a disaster information list that enables the disaster situation to be effectively determined.