Internet of Things (IoT) enabled LoRaWAN® system is adopted to monitor concrete temperatures in real-time via wireless devices embedded within concrete cover. Maturity method is employed to predict compressive strength development of steam cured precast concrete segments produced at an automated manufacturing plant using carousel system. The concrete segments embedded with IoT devices are exposed to steam curing in thermally insulated chambers and transferred to the evacuation line outside of the plant after being demolded. Real-time temperature measurements are continuously compared to predefined target values, so that an email notification could be send to production engineer. In this study, concrete temperatures as well as curing ambient temperatures for two different cases during segment manufacturing are successfully recorded. The details of IoT wireless system to estimate the strength of concrete are presented.