Based on direct observations of the Kara Sea level from 20 coastal points, the mean contributions of processes on different time scales (nontidal mesoscale oscillations, semidiurnal and diurnal tides, synoptic-scale oscillations, long-term tides, seasonal and long-term variations) to the total variance of sea level variations are estimated and maximum nontidal oscillations on different time scales are determined. It was found that synoptic-scale sea level variations prevailed at most points of the Kara Sea. Their mean contribution to the total variance ranges from 26 to 71%. Maximum variations reach 88 cm in the north of the sea, increasing up to 300 cm in Yenisei Bay. The most intensive synoptic-scale sea level variations are generated at intervals from 52 to 122 days and from 7 to 16 days.