The tide in the Mediterranean Sea is typically semidiurnal (two high and two low waters each tidal day, with little or no inequality between the heights of successive high or successive low waters) except for parts of the Adriatic Sea where the tide is mixed (two high and two low waters each day, with marked inequality between successive high and successive low waters) or where the tide at times becomes diurnal (one high and one low water each day). There is an amphidromic point (where the tidal range is zero) in the Strait of Messina, the Strait of Sicilia, and the Adriatic Sea. The mean and spring tide ranges are small and average less than 0.6m. In the Strait of Gibraltar, the range of the tide is about 0.9m. The range decreases farther E until, along the coast of Spain near Cartagena, in the Islas Balereas, and along the coast of Algeria from Tenes to Djidjelli, there is very little tidal range at all. Elsewhere the range is less than 0.3m., except in the Gulf of Gabes, where the range increases to nearly 1.8m at Gabes. The tidal range in the Mediterranean Sea and the Ionian Sea is only a few centimeters.
Meteorological conditions may influence water level heights more than astronomical forces. In the western Mediterranean Sea near Sicilia, sudden strong winds (marrobbio) may increase the water level about 0.9m above mean sea level; rapid changes of 0.3m may occur within a few minutes and cause problems for small boats in the area. In the central Mediterranean Sea, from February through April, the average sea surface height may be 0.5m below mean sea level. In the Adriatic Sea, a strong S or SE wind at Venezia will raise the water level 1.8m. Offshore winds frequently lower water levels along the E shore of the Adriatic Sea and along the leeward side of the islands in that region.