Croatia has a Mediterranean climate with dry and warm summers and with moderate and wet winters.
The most popular sailing routes and most known part of Croatia for visiting is its coast and islands in the Adriatic sea.
Most of the coast and Dalmatian coast especially has a mild Mediterranean climate characterized by mild winters and warm and dry summers. Most of the Croatian south islands have a plenty of sunshine even during the winter time. Going on the north to the Gulf of Kvarner the climate is more as continental, winter is colder and summers on this part are not completely out of the rain and there are more possibilities for summer thunderstorms.
The best time to plan your sailing in Croatia is in early summer (May, June) and early fall (September, October) because you can expect more sunny days with temperatures of the air and the sea ideal for swimming and more ideal sailing winds. Also, all the tourist facilities are still running up but there are no crowds both on the land and sea.
Still, the coastal part of Croatia is constantly winded which is great for sailing lovers but for your safe and pleasant sailing trip you must know most common winds in Croatia.
JUGO or SCIROCCO is the most common wind at the south Adriatic, Dalmatia. It is south-east warm and wet wind, frequent in the fall and spring and brings bad weather and high waves that can reach up to 5 m height in the open sea and then weakens towards the coast. Jugo never starts suddenly and never surprises as it develops slowly and gains its strength on the second or third day. In the colder time of the year, it can last for several days (up to 10) and sometimes reach the speed of the 110km/h and disable marine traffic. In the summer it usually doesn't last more than 3 days and it blows less frequently and at a slow speed. There are two types of Jugo - cyclone jugo with low darkening clouds and high humidity with rains, sometimes thunderstorms and anticyclonal jugo with sun or small clouds but without the heat and spark.
BURA is strong north-east wind characteristic for the North Dalmatia and Gulf of Kvarner. It is a dry, brisk and turbulent wind that blows from the mainland along the eastern coast of the Adriatic sea. It is most common in winter and it blows continually for a few days, forcing at the night reaching the speeds of a hurricane (the biggest recorded speed of the wind was 212km/h). The force of this wind is due to the cold air from the mountain (Velebit) that rush down through the narrow seaside coast to the sea and the air stream reaches high speed with stronger strokes and shorter pauses for the which the strength of the wind weakness. It is very dangerous for the smaller boats as it can appear almost suddenly reaching the strong wind. Also, a strong wind blows the seawater into tiny droplets like spray, so-called "sea smoke" which is very dangerous for sailors as it not only decreases visibility but hinders the breathing. Bura is less frequent in summer with weaker wind force and short duration, max up to 2 days, most likely just a day. Some areas are naturally protected from the Bura wind like the leeward side of Dugi otok and Kornati islands, the coastal area of Zadar channel, the leeward side of Unije island...
MAESTRAL/MISTRAL is a common northwest summer wind. It is a daily wind beginning to blow at the early noon with the highest wind about 2PM (because the land warms up faster than the sea and the difference of pressures and temperatures creates the wind) and ends up at 6 PM. It is followed by a nice and stable weather and it lessens the summer heat. It is the most pleasant wind for sailing with any big waves. It is popular for surfing and kitesurfing in areas where it gains strength passing through the narrow passes like Brac and Peljesac channel.
Also, on the Adriatic sea, there is a thermal storm called NEVERA. It's a brief and powerful thunderstorm caused by the summer heat, high humidity and warm nights. Nevera is a sudden storm that comes in a great speed from the west (open sea) and you can predict it with the development of the big dark cumulus clouds on the horizon accompanied by lightning. It is characterized by a strong, stormy wind and rain.