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Tidecharts for Guam

Daily tide predictions are provided as a public service by the University of Guam Marine Laboratory. Tidal heights are given for Apra Harbor in feet above and below mean low water. Actual heights around Guam can vary from these estimates by more than 30 minutes. The charts also include times for moonrise, moonset and moon phases. The tide tables give only astronomic tides, i.e., only the variations in the height of water resulting from the gravitational forces of the sun and moon. The total height of water is the sum of the astronomic tides with the variations due to other factors, such as wind, waves, atmospheric pressure and coastal topography. Estimates for Guam and other Mariana Islands are also available online at several sites, including FreeTideTables.com

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Copyright 2005 University of Guam and The Marine Laboratory. All rights reserved.

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