In the period 1960-2015, the mean sea level along the Slovenian coast rose by 10 cm. On average, this means a rise of 1.7 mm/year and, in the last 20 years, 5 mm/year. It is estimated that the rise of mean sea level is affected by global sea level rise and, in the last period, by extreme weather conditions in the region. Over the past twenty years, the sea level along the Slovenian and Adriatic coast has been rising at a rate surpassing European and global trends.

Phytoplankton biomass expressed as chlorophyll a concentration reflects the changes in nutrient content in the marine environment. Based on phytoplankton biomass values, a trend of improvement has been observed. The state of Slovenian sea bodies is estimated to be good or very good.

Based on monitoring data for the period 2006–2008, five Slovenian marine water bodies were classified as being in a poor chemical state. This state was determined by values that exceeded the environmental standard of the quality of tributyltin compounds, which have been monitored at the level of the European Union since 2007. Three marine water bodies have been determined to be in a good or very good ecological state.