Do full moons cause higher tides?

Full moons are associated with spring tides, which normally have a larger range: higher high waters and lower low waters than neap-tide periods at the same location.

Does a new moon also create spring tides?

Yes. New and full moons both align the main tide-producing forces, so both are associated with the larger spring-tide range.

Which moon phases produce neap tides?

First-quarter and third-quarter phases are associated with neap tides, when the typical difference between high and low water is smaller.

Does moon phase tell me the exact tide time?

No. Exact times and heights come from a local tide station prediction. Moon phase explains part of the repeating range pattern.

Why can the actual water differ from a moon-based expectation?

Wind, atmospheric pressure, river flow, and local basin geometry can move observed water above or below an astronomical prediction.

Is the rule of twelfths an official NOAA prediction method?

The official sources used here do not establish that shortcut as a substitute for station predictions. Use current NOAA predictions and observations for decisions.

How Moon Phases Affect Tides: Spring and Neap

Learn how new, full, and quarter moons shape spring and neap tidal ranges, then check official station predictions before planning coastal water time.