Manado 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 07:00 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 Asia/Makassar local. Folk tradition, not a scientific forecast.

Next spring tide on Sun 17 May (range 2.5m). Next neap on Thu 14 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.

Manado is the capital of North Sulawesi province, a city of 430,000 on the western tip of Sulawesi's northeastern arm. The Celebes Sea stretches to the northwest; Bunaken Marine National Park begins 8 kilometres from the harbour. The city sits almost exactly at 1.5°N — far enough from the equator for a modest diurnal inequality in the tides, close enough that the trade-wind seasonality is less marked than in higher latitudes. The tidal regime at Manado is mixed semidiurnal with a spring range of approximately 1.5–2.0 m above Chart Datum. Two unequal highs and two unequal lows occur each day; the higher high water reaches 1.4 m above Chart Datum on springs, the lower low drops to 0.3 m below. Near the equator, the diurnal inequality in tidal height is driven by the moon's declination cycle: when the moon is near the equator (every two weeks), the two daily highs are nearly equal; when the moon reaches maximum declination (23.5°N or S), the inequality is at maximum. This creates a fortnightly rhythm in tidal pattern that supplements the standard spring-neap cycle. Bunaken Marine National Park encompasses five small islands: Bunaken, Manado Tua, Montehage, Siladen, and Naen. The defining feature is the vertical reef walls — drops from 3 m to 200+ m, among the steepest in the tropics. The 1.5–2.0 m tidal range affects the wall dives directly: at low water, the wall top where reef life is densest is exposed or in very shallow water, limiting access to the upper 2–3 m. At high water, the wall top is covered to 2.0–2.5 m — fully accessible and giving the complete multi-level dive experience. Tidal currents off the Bunaken wall dives are the key operational variable for dive planning. The Bunaken Channel, between Bunaken and Manado Tua islands, runs 1.5–2.5 knots on spring tides. Dive operators time their drop for the early flood, running divers along the wall in the gentle current with the wall on their right, surfacing near the boat anchored downstream. The last 30 minutes of the ebb — as the current slows to near-zero — produces the calmest conditions for the shallow safety-stop and surface interval; operators who time the dive to finish at slack get the most comfortable decompression phase. The boat trip from Manado to Bunaken takes 30 minutes on the fast public ferry, 40–50 minutes on resort dive boats. The approach to the island pier is a shallow reef-flat section 100–150 m wide where the coral heads range from 0.5 m to 2.0 m depth. At spring low water the coral heads at the shallowest section are 0.3–0.5 m below the surface — dive boats drawing 0.8 m need to approach the pier at high water or use the deeper western channel. The island day-trip operators run their return boats timed to the afternoon high water window for this reason. For shore divers at Bunaken village, the entry off the beach in front of the dive centres is tide-dependent. At high water, divers enter directly from the beach into 1.0–1.5 m of water over the sandy shallows and swim 40–60 m to the reef edge. At spring low water the entry wading distance extends to 80–120 m over exposed coral rubble — feasible in booties but uncomfortable in bare feet. Most shore divers time their entry to high water for a cleaner approach. For snorkellers staying on the island or arriving by day boat, the shallow reef on the south and east sides of Bunaken at high water gives 10–25 m visibility over parrotfish, bumphead parrotfish, surgeonfish, and hawksbill turtles that graze the reef. The bumphead parrotfish school — sometimes 50–80 individuals — arrives at the shallow reef section at dawn on the incoming tide and leaves as the tide drops. The dawn high-water window is specifically productive for this encounter. For coastal families visiting Manado city itself, Malalayang Beach at the south end of the city front is the nearest accessible shoreline. The beach is narrow volcanic sand; the Celebes Sea at this latitude is 28–30 °C year-round. At low water the inner reef flat is accessible for wading. The view across the bay toward Bunaken and Manado Tua is the signature coastal shot from the city. All tide predictions for Manado come from the Open-Meteo Marine gridded model. Timing accuracy is ±45 minutes; height accuracy is ±0.3 m above Chart Datum.