September is the last month of high tourist activity in Croatia. It features a more intimate experience of travel which is loved by couples and those who prefer sightseeing with fewer crowds on popular spots.

Table of Contents
Smaller beach destinations in September 2022
Unusually fresh weather in September 2022 negatively impacted some of the smaller beach destinations in Croatia, which finished their summer season a bit earlier than expected.
September tourism in places like Grebastica, Brodarica, and Rogoznica is highly dependent on weather, which is not contributing this year.
That's why I recommend sticking with more popular destinations which may have more activities and rich tourist offers at this time of the year.

Big destinations in late September 2022
Despite a bit fresher weather, popular Croatian destinations like Split and Dubrovnik still have a fully active tourist season. Some people may feel demotivated to go to a beach and swim, but they spend more time sightseeing instead. Those who stay in Split can choose among many day trip options, which will remain available till the end of October.
The most popular one is an island hopping tour with a visit to Blue Cave on Bisevo.
Other trips include visit to Trogir, Sibenik, Primosten, Krka National Park, Kliss fortress, and the ancient Salona locality. Those places feature UNESCO heritage sites and Game of Thrones filming locations.

Dubrovnik has been well widely known as the most popular Croatian tourist spot.
Featuring a cultural inheritance that preserved its full integrity, and defensive walls which are hard to be found anywhere else, Dubrovnik is a must-see place not only in terms of Croatian tourism but in the whole of Europe.
Those who reside in Dubrovnik may go for a day visit to Cavtat, Mostar, and Ston.