The climate along the Croatian coast is typically Mediterranean, with mild and rainy winters and hot, dry summers. Air temperatures vary by region. In the north, summer temperatures average about 34°C, while in the south they average about 38°C. In winter the temperature range is between 8°C and 15°C.

Water temperatures during the summer range from 22°C to 25°C at the surface, to 19°C and cooler at 12m and below. During the winter the water is much cooler, with surface temperatures generally around 11°C.
The dive season runs from May through November. September and October are considered the best months for diving, since the air temperature is not too hot, and the water temperature still fairly warm. Winter diving is not commonly done, due to the cold, rough water conditions.

Wave height typically ranges between 0.5m and 1.5m, though occasionally waves can be as high as 5m. Divers should be careful when entering and exiting the water in areas that are exposed to strong waves. There is little surge in Croatian waters.

Currents in the Adriatic are generally weak. The exception to this rule of thumb are channels and passages between islands, where currents can be quite strong.

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