Аннотация:The paper presents the analysis of a number of storms and the trends for average annual and maximum annual of significant wave height based on the results of wave model WAVEWATCH III and the Peak Over Threshold method. The mean, maximum and 95th percentile SWH were analyzed for the Caspian Sea. Significant positive trends were found for the number of storms with SWH > 3–4 m. A significant positive trend was found in total storm duration: every 10 years, the number of stormy days with SWH > 2 m increases by 4 days. Trends were calculated for the average annual and maximum annual SWH at each point of the Caspian Sea. The maximum significant positive trends—0.03 m/10 years, the minimum trend value −0.03 m/10 years. For the average and maximum annual SWH values, negative trends observed for the area of the border between the Middle and South Caspian. The maximum values of trends are observed in the western part of Middle Caspian Sea.