King tides in Guam, 2026
The biggest predicted tide in Guam in 2026 reaches 2.5 ft above MLLW at Tanapag Harbor, Saipan Island on Wednesday, June 17, at 11:26 PMlocal time. Below are all of the year's king tide windows — the top 1% of predicted highs — for NOAA reference stations along the Guamcoast. King tides are perigean spring tides: they arrive when a full or new moon lines up with the moon's closest approach to Earth, and they preview the flooding that sea level rise will make routine. Read how king tides work.
Tanapag Harbor, Saipan Island
King tides (2.4 ft and above) at NOAA station 1633227. Full year: 2026 tide table.
- Jan 4 — peaks 2.4 ft at 9:34 AM
- May 18–19 — peaks 2.5 ft at 11:46 PM
- May 21 — peaks 2.5 ft at 12:41 AM
- Jun 16–17 — peaks 2.5 ft at 11:26 PM
- Jun 19 — peaks 2.5 ft at 12:10 AM
- Dec 25 — peaks 2.5 ft at 9:53 AM
NOAA CO-OPS harmonic predictions, datum MLLW, station local time. Actual water level can run higher with storms, onshore wind, and low pressure — king tide + storm is the flooding combination to watch. Predictions are for planning, not navigation.
Also available: Guam king tides 2027.