Experiments are constructed and conducted at Faculty of Engineering Kafrelsheikh University, Egypt. The experiments were carried out at the period from 9 a.m. to the sunset, during April 2013 to July 2013. The solar radiation, atmospheric temperature, basin temperature, saline water temperature, glass temperature and distilled water productivity were measured every hour. However, the accumulated productivity during the 24 hours had also been measured in each test. The depth of the saline water in the solar stills is holding constant during the test manually by using a make-up saline water tank and control valve every hour. All measurements were performed to evaluate the performance of the conventional basin still and the modified basin still under the outdoors of Kafrelsheikh City conditions.