Blue Cave Montenegro

Montenegro’s Blue Cave is a sea cave on the outer, seaward face of the Luštica peninsula — outside the Bay of Kotor, past the mouth, on the open Adriatic. Every practical thing about visiting it follows from that sentence.

The bay is a flooded river canyon with mountains on both sides and one narrow entrance. It is close to the most sheltered water in the Mediterranean. The cave is on the other side of that shelter. So you can stand on the quay in Kotor looking at glass-flat water and still have your cave stop cancelled, because the swell that matters is happening 20 kilometres away, around a headland you cannot see.

See cave tours and today’s sea state

How often is it actually closed?

We measured it rather than guessing. Across 792 hourly marine readings between 2 August and 3 September 2026, taken at the cave mouth itself:

• Under 0.30 m — about 76% of hours. The cave is simply open.
• 0.30–0.50 m — about 19%. Marginal; the skipper decides on the morning.
• Above 0.50 m — about 5%, peaking at 0.90 m.

So in high season, roughly three days in four are straightforwardly fine and about one hour in twenty is genuinely rough. Those are good odds, and they are much better than the anxious tone of most cave listings suggests. But they are high-season odds — one month, in August. A February reading would look nothing like this, which is part of why the season runs May to October.

The honest limit: no operator publishes a cancellation threshold, and the model describes the sea rather than the skipper. A small open boat and a large cruise boat do not make the same call on the same morning.

Can you swim in it?

Usually yes, and on most tours the swim is the point rather than a bonus. In July and August the water here sits near 28°C, warm enough that the stop stops being a novelty.

Two caveats worth having in advance. The swim is normally just inside or just outside the cave mouth rather than deep inside — the interior is small and boats are queuing. And roughly half the tours here do not include a swim stop at all: the short Perast runs have no time, and some cave circuits are sightseeing only. If swimming matters, check it is named in the inclusions rather than assumed from a photograph.

Bring a towel. Very few of these boats carry them.

Is it worth it?

Yes as one stop on a circuit; no as a destination in its own right. That is the honest framing, and it is why almost nobody sells a Blue-Cave-only trip.

The cave is genuinely pretty — the blue comes from light entering below the waterline and reflecting off a pale bottom, so it reads electric in the middle of the day and dull grey early or late. But it is a stop of perhaps fifteen minutes on a three-hour trip whose other components are the Yugoslav-era submarine tunnels cut into the cliffs, Mamula island, Our Lady of the Rocks, and the swim. Priced as one-fifth of a good morning it is excellent value; priced as the reason for the day it will underwhelm.

And it is not the famous one. Croatia’s Blue Cave is on Biševo, off Vis, about 300 kilometres north-west, visited on a long timed-entry day trip from Split or Hvar. They are different caves in different countries, and people book the wrong one every season.

Which cave tour?

Pick by how much of the day you want to give it:

Prices, ratings and review counts from our September 2026 data check; operators use seasonal pricing — treat them as the shape of the market, not a quote.

If the sea is up

Do not book a cave trip and hope. Book one with free cancellation, and if the morning turns, take the alternative that was always going to run: a bay tour to Perast and Our Lady of the Rocks never leaves shelter, and in a full month of hourly readings the inner bay did not once cross half a metre. It is a different, calmer, prettier trip rather than a consolation prize.

The full comparison of every Kotor boat tour is on the homepage, and the island itself has its own page — including the shuttle that gets you there without any tour at all.

We are not affiliated with any boat operator or with the Municipality of Kotor. Tours on this page are sold by GetYourGuide and we earn a commission if you book through our links, at no extra cost to you. Sea conditions change hourly — confirm with your operator on the day.