Brač is the large island immediately south of Split, with Šolta to the west and Hvar to the south. Its north coast looks at the mainland and the mountains behind Split and Makarska. Its south coast looks the other way, towards more open water and Hvar. That split is the whole weather story for a small boat: the two sides of the same island are not the same day. The Split guide covers the channels you cross to get here, and the Hvar and Vis guide covers the water on the far side.
A ridge runs the length of Brač, high enough that wind does not simply stop at the skyline. The west end, around Milna, is a common lunch stop from Split because it is close and has shelter. The south coast, including Bol, faces away from the mainland. The north coast, from Supetar eastwards, faces the channel under the mountains. Ferries cross to Supetar and to other ports, so the north side is also a traffic side.
Bura. This is the wind the north side feels. Gusts come off the mainland mountains, especially under Biokovo to the east, and the channel between Brač and the coast has room for a short sea. The north side is uncomfortable in a strong Bura. The south side is usually the calmer water in that wind, although gusts can still come over the ridge. Read the Bura guide before you treat a clear sky as a calm day.
Jugo. A south-easterly reverses the island. Swell arrives on the south coast, and Bol and the other south-facing bays take it. The north side, in the lee of the island, is often the kinder water. The sea can stay up after the wind drops. See the Jugo guide.
Maestral. The summer north-westerly blows through the Split and Hvar channels in the afternoon. Milna and the west end can be lively. Plan the exposed hop for the morning, as the Maestral guide describes.
Thunderstorms. Storms off the mainland cross the narrow channel quickly. Watch the sky over the mountains in the afternoon.
From Split, an early crossing to the west end or the north coast is the classic short day, with the return before the afternoon breeze peaks. On a Bura day, do not commit to a north-coast bay. On a Jugo day, do not commit to Bol just because the town is calm when you leave. If the board for your boat is already cautious at the berth, the channel will not be kinder.
Set Split, Milna, Supetar or Bol as the base and open the live board. Gusts, the named wind and the wave height are what the verdict uses. Check DHMZ as well.
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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