If you want to explore when crowds are smaller, go in January. You could snag some great deals on hotels with parking in Donji Proložac around then. The warmest weather is in July, with temperatures ranging from 61ºF (16ºC) to 79ºF (26ºC). It's generally coolest in January, averaging between 34ºF (1ºC) and 43ºF (6ºC).