Sumner Beach, Christchurch 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 16:00 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/Auckland local. Folk tradition, not a scientific forecast.

Next spring tide on Tue 19 May (range 2.3m). Next neap on Fri 22 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.

Sumner Beach is Christchurch's beach suburb, 12 km southeast of the city centre at the mouth of the Avon-Heathcote Estuary where it meets the Pacific Ocean. The suburb sits between the sea and the unstable volcanic cliffs of the Banks Peninsula foothills — a setting that was central to the 2011 Christchurch earthquake sequence. The tidal pattern at Sumner is semidiurnal with a mean range of approximately 1.8 m above LAT, one of the larger ranges on the Canterbury coast, giving the beach a wide tidal zone that shifts the surf break position significantly through the cycle. The 22 February 2011 Christchurch earthquake (magnitude 6.2, 185 deaths) triggered multiple cliff failures along the Sumner hillside above Esplanade Road. The fragile rhyolite and loess cliff faces, already weakened by the September 2010 earthquake, shed large sections that destroyed houses, blocked roads, and fundamentally altered the skyline. Several cliff-top properties were subsequently red-zoned. The cliffs above Sumner Beach are geotechnically monitored and fencing below unstable sections is permanent. The base of the cliffs near Cave Rock is not a safe area in any rain or seismic event. Cave Rock (Tuawera) is the iconic basalt outcrop sitting on the beach at Sumner's eastern end — a volcanic plug from the Banks Peninsula volcanic system that provides both a landmark and a climbing venue. The rock is accessible at low tide by walking along the beach, and the short bouldering and toprope routes on its seaward face are a local institution. At high tide, the base of Cave Rock is partially washed by the sea, and the beach narrows to nothing at the most swollen spring tides. Sumner has a consistent beach break driven by southeast and east swells that refract around Banks Peninsula. The break works at most tide stages but is at its most organised on mid tide — the high-tide shorebreak is steep and short; at low water the wave energy is distributed more widely across the sand. Water temperature runs 13°C in winter (August) to 18°C in summer (February); a 4/3mm wetsuit is standard year-round. The Avon-Heathcote Estuary (Ihutai) behind the beach is a significant habitat for migratory and resident wading birds. The estuary mouth is managed by Environment Canterbury (ECan). Kayaking through the estuary channels is popular from the Ferrymead boat ramp, particularly on the flood tide when the channels are navigable through the reed beds. Predictions on this page come from Open-Meteo Marine, a gridded global ocean model. Accuracy is typically within ±45 minutes on timing and ±0.2–0.3 m on height — model-derived, not from a local gauge. For authoritative New Zealand tide data, consult Land Information New Zealand (LINZ) at linz.govt.nz.