Hagåtña tide times

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived.

Model-derived from a global ocean grid. Useful indication; expect about ±45 minutes on average vs. a local harmonic gauge, individual stations vary widely. See /methodology for per-region detail. Not for navigation.

Conditions as of 09:00 local time. Refreshes daily.

Predictions: Open-Meteo Marine (MeteoFrance SMOC, 0.08° grid) — heights relative to MSL (not chart datum / LAT). Model-derived. · Not for navigation.

The angler tradition for major/minor fishing windows: major ≈3-hour windows around moon transit and opposition; minor ≈2-hour windows around moonrise and moonset. Times are Pacific/Guam local. Folk tradition, not a scientific forecast.

Next spring tide on Mon 18 May (range 1.0m). Next neap on Sun 17 May.

Spring tides cluster around new and full moons (biggest swings). Neap tides land on quarter moons (smallest swings). See the spring tide and neap tide glossary entries for the why.

Hagåtña — the capital of Guam, historically known as Agana — sits on the western coast between Tumon Bay to the north and Apra Harbor to the south. It is the governmental and cultural heart of the island: the Governor's Complex, the Guam Legislature, and the Chamorro cultural institutions occupy the low-lying land between the hills and the harbour front. The city was almost entirely destroyed in the 1944 Battle of Guam and rebuilt in the post-war period; the historic latte stone pillars at Skinner Plaza are among the few pre-war built structures remaining. The tidal conditions at Hagåtña match Guam's mixed semidiurnal pattern: spring range 0.5–0.7 m, with pronounced diurnal inequality. The Paseo de Susana Park waterfront faces west across the approach to Apra Harbor. The waterfront here is a manmade land-fill peninsula extending into the harbour mouth, ringed by a low seawall and promenade walkway. At spring high water, the seawall base is 0.3–0.4 m above the waterline; at spring low, the seawall base is 0.7–0.9 m above — the same seawall, but the water is visibly lower and rocky substrate is exposed at the base. For swimmers, the shoreline at Hagåtña's Paseo de Susana and the adjacent Ypao Beach Park (1 km north) are the accessible entry points. Ypao Beach has a sandy floor and is reef-protected; the tidal range here produces the same 10–15 m beach-width variation as elsewhere on the western coast. The public boat ramp at the south end of Paseo de Susana is the main small-craft launch point for the Apra Harbor approach; at spring low water the ramp is dry from the waterline by 0.5–0.6 m — usable for launching with a short carry, but not driveable to the water's edge. For paddlers, Hagåtña is the practical base for the inshore kayak route south to Apra Harbor and the route north toward Tumon Bay. The 8-kilometre route north along the reef-protected coast to Gun Beach runs inside the fringing reef for most of its length; the reef provides shelter from the NE trade-wind swell but the channel between the reef and the shore narrows to 30–50 m in places at low water and requires care to avoid grounding. High water is the preferred time to run this inshore route. The Chamorro cultural sites accessible on foot from the waterfront are not tide-dependent, but the Paseo de Susana loop at low water — when the rocky lower seawall is exposed — reveals a tidal flat of small invertebrates and the occasional crown-of-thorns starfish that is absent from the scene at high water. This is a minor natural-history observation, not a scheduled attraction, but it is concrete and specific to low-water conditions. For photographers, Hagåtña's strongest visual material is cultural: the latte stone site at Skinner Plaza, the Spanish Bridge ruins, the Cathedral Basilica of the Immaculate Conception. The waterfront at Paseo de Susana offers a wide western horizon with no reef structure to obstruct the view — the open Philippine Sea is visible at all tidal states. Evening light from 17:00 to sunset illuminates the western facades of the government buildings fronting the promenade. Anglers use the Hagåtña Boat Basin as a departure point for offshore fishing rather than fishing the urban waterfront itself. The inner basin is a working harbour with limited shore-fishing access; the north jetty at the basin entrance is the most accessible structure, where bottom fishing at dusk targets triggerfish and small snapper that forage in the turbid water around the harbour pilings. The tidal current through the basin entrance runs 0.3–0.4 knots on the flood and ebb, concentrated by the jetty walls — fishing the current seam off the jetty tip is the standard approach. For boaters transiting to or from Apra Harbor — Guam's main deep-water port and the US Navy base — the Hagåtña Boat Basin is the civilian small-craft alternative. Vessels transiting the harbour approach should note the military exclusion zones around the naval base; the outer boundary is charted and marked. Tidal current in the Apra Harbor approach is 0.4–0.8 knots on spring tides and does not normally constrain vessel movement in the approach channel. All tide predictions for Hagåtña come from the Open-Meteo Marine gridded model. Timing accuracy is ±45 minutes; height accuracy is ±0.3 m above Chart Datum.