Which Greek islands are most affected by the Meltemi?

The Cyclades (especially Mykonos, Santorini, Paros, Naxos, Milos) and the northern Aegean islands are most exposed. The Ionian islands (Corfu, Kefalonia, Zakynthos) are largely protected by mainland Greece. The Dodecanese (Rhodes, Kos) experience a moderate version of the Meltemi.

Does the Meltemi cancel ferries?

Yes. At Beaufort 7–8, high-speed catamaran services are typically cancelled or significantly delayed. Large conventional ferries (Blue Star) generally continue in Beaufort 6–7 but may be delayed or cancelled at Beaufort 8+. Always check conditions on the day and have a contingency plan.

How do I check if the Meltemi will affect my ferry?

Monitor the Beaufort forecast for your specific crossing 24–48 hours ahead. Morning departures (before 10:00) are almost always calmer — the Meltemi typically builds from midday and peaks in the afternoon. Use the Beaufort guide on Teleporio to understand what each level means for your crossing.

Is it still worth visiting Greece in July and August despite the Meltemi?

Absolutely. The Meltemi makes summer in Greece bearable — it prevents the suffocating humidity of other Mediterranean destinations. Most ferry routes still operate. The key is booking morning crossings, preferring larger ferries over catamarans, and having flexibility in your schedule.

Teleporio™ — Greek Island Travel Intelligence

The Meltemi Wind: Planning Your Greek Ferry Trip

Q: What is the Meltemi wind?

The Meltemi is a strong, dry northerly wind that blows across the Aegean Sea primarily from mid-July through August. It originates from high pressure over the Balkans and flows south through the Aegean, often reaching sustained Beaufort 5–7 and occasionally Beaufort 8 during peak events.

What is the Meltemi? How it affects Greek ferry crossings, which routes are worst affected, and how to plan your island hopping trip to avoid rough seas.

Teleporio™ travel intelligence

What is the Meltemi Wind?

The Meltemi (also called Etesian winds) is the prevailing summer wind of the Aegean Sea. It blows from the north and north-northwest, driven by a semi-permanent low pressure system over Pakistan and a high pressure system over the Balkans. The Meltemi is not a storm — it is a sustained seasonal wind that builds through the morning, peaks in the afternoon (often Beaufort 5–7), and eases overnight and in the early morning.

It typically establishes from mid-July and runs through late August, though in strong years it can begin in late June or extend into September. It is predictable, regular, and the single biggest factor in planning Greek ferry travel during summer.

Which Routes Are Most Affected?

The Meltemi affects the open Aegean Sea most severely. The routes with the highest disruption risk include:

Santorini to Mykonos: Exposed central Cyclades crossing. Catamarans frequently cancelled or delayed in Beaufort 5+.
Piraeus to Santorini (high-speed): The southern Cyclades route is exposed for several hours. High-speed vessels (SeaJets, Hellenic Seaways) cancel more often than large Blue Star ferries on this route.
Ios, Sikinos, Folegandros: Small islands in the southern Cyclades with limited shelter. Catamaran services to these islands are frequently suspended.
Mykonos to Naxos/Paros: Short but exposed crossings that can be rough in strong Meltemi.
Rhodes to Kos (open sea): Less affected than the Cyclades but can see Beaufort 4–5 during strong Meltemi periods.

Routes That Are Sheltered from the Meltemi

Some routes are relatively protected from the Meltemi by geography:

Ionian islands (Corfu, Kefalonia, Zakynthos): On the western side of Greece, sheltered from the northeast Aegean Meltemi.
Saronic Gulf (Athens to Hydra, Aegina, Poros): Partially sheltered by the Attica peninsula.
Rhodes to Symi: The crossing is short and partly sheltered by land on both sides.
Kos to Kalymnos: A 15-minute crossing with some island shelter.

How to Plan Around the Meltemi

The most practical strategy: book morning crossings. The Meltemi builds through the day and peaks in the afternoon and early evening. A 07:00 or 08:00 departure across an exposed Aegean route will almost always see calmer conditions than a 14:00 or 16:00 departure. On days forecast for Beaufort 6+, even large Blue Star Ferries may delay or reroute, but morning sailings are far less affected.

Build buffer days into your itinerary during July and August. If your schedule has zero flexibility and you must catch a flight from Athens on a specific day, plan to be back on the mainland the day before — not the day of. Island hopping on a fixed one-night-per-island schedule in August is the fastest way to miss a connection.

Turn the Wind Into a Crossing Decision

The Meltemi is the pattern; the Beaufort scale gives you the language for what that pattern can mean at sea. Before a specific sailing, check ferry conditions alongside the operator timetable rather than treating either one as a promise.

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