Natural dry draft cooling towers are one of the most popular types of towers in power plants that are being used in dry climate areas. One problem with this type of tower is the impact of environmental factors on their performance. Wind is one of these factors. Wind develops a phenomenon called wind cover that prevents outgoing gasses from escaping. In this work, the effects of wind on flux and distribution of output velocity in tower outlet is studied by using wind tunnel and hot wire anemometer. Also the effects of wind break walls are studied with respect to hampering these effects.