The sea stays warm, the queues go, and the ferries switch to the winter timetable at the end of the month. National park prices, however, stay at peak rates until 30 September, which is the one trap in an otherwise cheaper month.
Checked: 31 August 2026
September is the month Croatian tourism quietly recommends to itself. The Adriatic holds the heat it collected all summer, so the water is at its warmest of the year in the first half of the month, while the crowds thin out from the first week onwards as European schools go back. What changes is not the weather so much as the pressure: the same coastline, minus the queue for the parking space.
The trap: national parks stay expensive
If you plan a September trip around Plitvice or Krka, note that both charge full high season rates until 30 September: 40 euro for an adult at either park. The cut to 23.50 euro at Plitvice and 20 euro at Krka comes on 1 October. A trip in the last week of September therefore pays peak prices for shoulder season conditions, and moving the same trip a few days later saves a family more than fifty euro.
Ferries move to the winter timetable
Jadrolinija's summer schedule ends in late September, and the winter timetable that replaces it runs through to the end of May. On the busy lines the change is a matter of fewer daily departures rather than none, but on the smaller island routes it can mean the difference between three sailings and one. Do not carry an August timetable into late September, and check the specific line the week you travel rather than assuming last year's pattern.
What is on in September
| Date | Event | Where |
|---|---|---|
| 02.-05.09. | 20th Vukovar Film Festival | Vukovar |
| 05.-06.09. | Croatian Walking Festival | Gospić, Lika |
| 11.-13.09. | Giostra historical festival | Poreč |
| 11.-17.09. | 59th PIF puppet theatre festival | Zagreb |
| 11.-20.09. | 61st Vinkovačke jeseni | Vinkovci |
How to use the month
The obvious move is the coast in the first half and the interior in the second. Swim while the sea is at its warmest, then head inland when the light turns and the first festivals start, because the wine regions and the national parks are better in cooler air anyway. If the trip has to be one or the other, the last week of September on the coast still gets swimming weather in the south, while the same week in Slavonia already has the harvest running.
Frequently asked questions
- Is the sea warm enough to swim in September?
- Yes. The Adriatic is at its warmest of the year in the first half of September, having stored the summer heat, and stays swimmable in the south into early October.
- Are Plitvice and Krka cheaper in September?
- No. Both stay at the high season rate of 40 euro for adults until 30 September. Prices drop on 1 October, to 23.50 euro at Plitvice and 20 euro at Krka.
- Do ferries run less often in September?
- From late September, yes. The summer timetable ends and the winter one begins, which mostly means fewer daily departures, and on small island routes considerably fewer.
Official sources
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