Jugo (Scirocco): the warm south-easterly that builds the sea

A Navigate Boats guide · Updated 3 November 2026 · In English only for now.

The Jugo, known as the Scirocco in Italian, is the Adriatic’s south-easterly. Where the Bura is sudden, dry and gusty, the Jugo is usually slow, warm, humid and grey. Its danger is less the first gust and more the sea it builds: blowing along the length of the Adriatic, it has a long fetch and raises a large, heavy sea and swell that keeps running even after the wind eases.

How the Jugo builds

A Jugo usually comes with low pressure moving towards or across the Adriatic. It often starts light, then builds over a day or more as the pressure falls. The sky tends to be hazy or overcast, the air feels heavy and damp, visibility drops, and rain or thunderstorms often follow. Distant islands fade into haze, which is a useful contrast with the sharp, clear air of a Bura day.

Because the wind blows along the sea rather than off the land, waves have room to grow. The southern Adriatic, the open outer sides of the islands and long channels that line up with the south-east see the biggest seas. A swell from the south-east can arrive before the wind itself becomes strong.

Where it matters most

Harbours, bays and anchorages open to the south or south-east, where swell rolls in and makes a night uncomfortable or unsafe.
Open crossings, including the passages between the outer islands and the routes south of Dubrovnik and towards Montenegro.
The outer, seaward side of island chains such as the Kornati, where the sea is open to the whole Adriatic.
Headlands and capes, where the sea is confused as waves bend round the point.

How a Jugo often ends

A Jugo frequently ends with a change of wind. When the low pressure moves on, the wind can swing quickly to the west or north-west, or a front can bring a sudden turn to the north-east and a Bura. That switch is a well-known Adriatic pattern: the boat that is snug in a bay sheltered from the south-east can suddenly find itself exposed to the opposite direction. Read the forecast for the end of the Jugo as carefully as for its start.

Planning a small-boat day around the Jugo

Look at the wave height and the swell as well as the wind. A moderate Jugo can still leave a sea that is too big for a small open boat.
Keep trips inside channels and in the lee of islands that face away from the south-east, and avoid the outer coasts.
Choose an anchorage or harbour with protection from the south and south-east, and have a plan if the wind turns.
Expect lower visibility and rain. Plan the route so you can follow the coast and recognise your landmarks.
A multi-day Jugo usually means waiting it out. The sea needs time to settle after the wind drops.

How Navigate Boats helps

The board names a south-easterly as Jugo and weighs the forecast wave height, not just the wind, in its verdict for your boat. The 7-day outlook and the hour-by-hour view show when a Jugo is forecast to build and when it is due to turn, so you can see the switch coming. Use it beside the official marine forecast from DHMZ or ARSO and the coastal radio broadcasts.

Check today’s go/no-go for your boat

These guides describe typical patterns, not today’s weather. Navigate Boats is a planning aid, not a navigation tool: before you go, check the official marine forecast and warnings from DHMZ (Croatia), ARSO (Slovenia) or the Montenegrin hydrometeorological service, and use your own judgement.

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