The dataset includes hourly averages of sea level measured at the tide-gauge station Bakar in the northern Adriatic Sea (Croatia). Sea levels are expressed in centimetres relative to the mean sea level (calculated over 18.6 year period centered around 1971.5). Data range from December 1929 to December 2017. Time is in UTC+1. The whole data series is recorded by a float-type chart-recording instrument and digitized from charts.