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Mismatch conditions in PV systems have been often analyzed only by means of differences in electrical parameters. Besides mismatches in PV modules' I-V characteristics, this paper, in addition, analyzes the influence of deviations in irradiation and temperature. By using PV cell-based model of PV string, developed in MATLAB/Simulink, several study cases have been investigated, such as electrical parameters mismatch, uniformly distributed and concentrated shades, operating temperature differences, etc. Also, the special analysis has been dedicated to study case considering simultaneous effect of various mismatch conditions. Presented simulation results have indicated significant reduction in PV string efficiency due to different combinations of mismatch conditions.