Waning Gibbous

A waning gibbous is the bright Moon phase after the Full Moon and before the last quarter, when more than half the lunar disc remains illuminated but is decreasing each night. For boaters, it means strong moonlight during the late evening and overnight, with moonrise occurring progressively later after sunset.

Its practical value is night visibility, not weather prediction. Moonlight can help watchkeepers identify headlands, marks and traffic, while reduced darkness may affect approaches to an anchorage. Tidal ranges and streams often remain influenced by the preceding Full Moon, so check Tidal Current and any residual Spring Tide effect before crossing bars, entering rivers or planning a night departure.

In PredictWind, moon phase is best considered alongside tide, current, wind and wave forecasts. Use it to judge natural illumination for watch schedules, anchoring and coastal pilotage, then combine that awareness with routing and departure tools for a safer, better-timed passage.