Please note that the hours presented are expressed in Coordinated Universal Time, which corresponds to the Winter period legal time. To get the Summer period legal time (between the last Sunday in March and the last Sunday in October), it is necessary to add 1 hour to the values presented.

Since the Hydrographic Zero plan (ZH) was fixed in relation to average levels adopted several decades ago, there is currently a systematic difference of about +/- 10 centimetres between the predicted tide heights and the actual water heights.

The water heights presented in the tide tables are referred to the port of Lisbon’s Hydrographic Zero level, located 2.08 meters below the average level of the sea waters, in Cascais.

Copyright Marinha, Instituto Hidrográfico, 2019.
Published following authorization No. 15/2020 by the Hydrographic Institute, Navy.
This publication does not replace the Hydrographic Institute official publications. The Hydrographic Institute declines any responsibility resulting from the use of the transcribed tidal elements.

These data are obtained from a tide gauge installed in Algés at the Maritime Traffic Control Center - VTS Lisbon, which is still in testing phase.