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 19:00 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 that rates each day for fish-bite likelihood using moon transits and rise/set. One to five stars, not a scientific forecast.

• Mon
  ★★★★★
• Tue
  ★★★★★
• Wed
  ★★★★★
• Thu
  ★★★★★
• Fri
  ★★★★★
• Sat
  ★★★★★
• Sun
  ★★★★★

Heraklion sits on the central north coast of Crete, the largest of the Greek islands and the southern boundary of the Aegean Sea. The city wraps the working harbour at the Venetian Koules fortress and runs inland and east through the modern commercial centre to the Knossos archaeological site five kilometres up the slopes of the Iouktas mountain. The tide here is the small Eastern Mediterranean signal characteristic of the Aegean and Cretan Sea basins: mean range at the Heraklion harbour gauge is about 0.15 metres, with spring tides reaching close to 0.25 metres and neaps dropping near flat. The astronomical signal is genuinely tiny because the Mediterranean connects to the Atlantic only through the narrow Strait of Gibraltar and the Eastern Mediterranean is the far end of an already weak tidal system. What matters more on a day-to-day basis is meteorological tide. The meltemi etesian wind from the north-east builds across the Aegean from June through September, funnelling down between Crete and the Cyclades and dropping water level on the windward northern coast by 20 to 40 centimetres on sustained events; the same wind builds choppy 2 to 3 metre seas in the Cretan Sea that the Heraklion-Athens overnight ferry rides through. The Hellenic Trench drops to over 4,000 metres just south of Crete in the Libyan Sea, one of the deepest sounds in the Mediterranean, and the abyssal-edge geometry concentrates seismic and tsunami activity along the southern coast. The defining cultural feature is the Minoan civilisation. The Knossos palace complex (active from about 2000 BCE to 1450 BCE) sits on the slopes above the working harbour and the entire Minoan thalassocracy of trade between Crete, the Cyclades, the Levant, and Egypt depended on the harbour at the foot of the palace. The Knossos site that Sir Arthur Evans excavated and partially reconstructed from 1900 onwards remains one of the most-visited Bronze Age archaeological sites in the world. The 1450 BCE collapse of the Minoan palaces has been associated by some researchers with the Thera (Santorini) caldera eruption tsunami that struck Crete's northern coast within hours of the rupture, with run-up heights estimated at 15 metres or more along the exposed shore — the connection remains debated but the tsunami physics fits the geography. The working ferry calendar to Athens (Piraeus), Mykonos, and Santorini runs from the Heraklion New Harbour, the diving sites along the Aghios Nikolaos coast east of Heraklion read the table for the inner-shelf access at low water, the Samaria Gorge mouth at Aghia Roumeli on the southern coast, and the Falasarna sand at the western tip of the island all read the wider weather pattern more than the tide table. The Hellenic Navy Hydrographic Service is the authoritative Greek tide source; Open-Meteo Marine drives the gridded predictions on this page.