Wireless temperature probe that allows the measurement of temperatures in horizontal stores of grain, individual silos or small groups of silos. The probes transmit the collected information to mobile devices (Smartphone, tablet) through a Bluetooth connection, thus avoiding the installation of wiring. Each probe incorporates several sensors (up to a maximum of 10) which allows the temperature to be monitored at different points of the stored cereal. The data of the temperatures can be consulted by means of a mobile device at the installation. In addition, by installing one or more scanning nodes, it is possible to access the data from any device connected to the Internet by means of a Web application.