The goal of the paper is in calulation of refractive index structure parameter from weather condition in selected area. Sadot - Kopeika model was chosen for determination of atmospheric turbulence during the whole day. Information about temperature, relative humidity, wind speed, time of sunrise and sunset is necessary for calculations in case of usage of the model. The main advantage of Sadot - Kopeika model is in possibility of prediction of refractive index structure parameter. We need meteorological data, so we compared the predictions for one and two days in advance from three online meteorological services. After that we have compared predicted data with data from meteorological station. Our work on the paper rely on the refractive index structure parameter prediction and comparison with calculated values from meteorological stations.