Recently, Free Space Optical (FSO) communication offers advantages over RF in terms of high bandwidth, security, and reliability. However, in contrast to RF links, the efficiency of FSO links is highly susceptible to error in foggy conditions, while it is performance is better in rainy conditions. In this paper, a hybrid RF/FSO communication model is proposed. The proposed model aims at enhancing the reliability and performance of target-detection applications (TD) in Wireless Sensor Networks (WSNs). The model is examined under various weather conditions and at different distances and number of nodes. It is demonstrated that the hybrid scheme surpassed individual RF and FSO schemes via exhibiting lower error rates and better target detection, particularly in adverse conditions.