An alarm assembly includes a receiver that is positionable in a vehicle. The receiver emits an audible alarm if the temperature inside the vehicle exceeds a predetermined level when the vehicle is occupied. A temperature sensor is operationally coupled to the receiver. The temperature sensor senses ambient temperature of the receiver's environment so the receiver emits the audible alarm. An occupant sensor is operationally coupled to the receiver. The occupant sensor is positionable beneath a child seat in a vehicle to communicate occupancy of the vehicle to the receiver. A bracelet is operationally coupled to the receiver. The bracelet may be worn by a child inside the vehicle so the bracelet communicates occupancy of the vehicle to the receiver. A collar is operationally coupled to the receiver. The collar may be worn by a pet inside the vehicle so the collar communicates occupancy of the vehicle to the receiver.