Generally, this disclosure provides devices, systems and methods for performance monitoring of WLAN data traffic offloading in wireless cellular networks. A wireless local area network (WLAN) access point (AP) may include a performance measurement module to measure the number of User Equipment (UEs) connected to the WLAN AP for data traffic offload and further to measure packet throughput from the UEs to the WLAN AP; a measurement granularity timer to trigger the performance measurement module to perform the measurements; a performance report generation module to generate a WLAN report based on the measurements provided from the performance measurement module; and a performance report timer to trigger the performance report generation module to generate the WLAN report.