The tidal regime is semi-diurnal. For Puerto Madryn (42 ° 46 ‘S – 65 ° 02’ W) the mean level is 2.99 m, with mean amplitudes of 4.69 m in syzygies and 2.87 m in squares.
The surface water temperature’s annual mean values are close to 13 ° C, with maximums in summer of 18 to 20 ° C and minimums in winter of 8 to 9 ° C.
The waters of Gulf Nuevo are generally transparent, the distinctive characteristic of the waters that surrounds Valdes Peninsula is the great amplitude of the tides. The geometry of the platform favors the amplification of the semi-diurnal tide throughout the entire Patagonian coastline. In particular, in the Gulf San José (Fondeadero San Román) the mean width is 5.8 m (with maximums of more than 8.7 m) and in the Nuevo Gulf (Puerto Madryn) the mean width is 3.8 m (with maximums greater than 5.7 m). Additionally, the geometry of the coast makes the tidal wave offset between the two gulfs is approximately 6 hours, that is, almost half an exact cycle.
The characteristic data of the tide can be found in the Tide Tables published annually by the Naval Hydrography Service of the Navy. Link