Daniel AsmusYacht charter broker, DMA Yachting
Usually, no. Most Croatia yacht charters cruise through relatively protected island waters, and a good captain will adjust the route if the forecast would make a passage uncomfortable.
Yacht type matters too. Catamarans are naturally more stable than monohulls, and many modern motor yachts use stabilizers to reduce rolling even further. Guests are much more likely to notice movement while cruising between islands than while sleeping, because nights are usually spent in calmer bays or marinas.
A fun example is HAPPY ME (https://mycroatiancharter.com/yacht/happy-me-132-benetti/), which has a gimbled pool table that adjusts with the movement of the yacht. It is a playful detail, but it also says something real about how far onboard comfort and stability have come.
If seasickness is a real concern, tell us early. We can help you choose not just the right yacht, but also the right area, route, and passage lengths from the start.