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Weather in Croatia in September

Hi Everyone,
We were supposed to visit Croatia and Slovenia this past April/May, but I had to cancel for medical reasons. I have re-scheduled our trip for this September. We leave the U.S. on September 3 and return September 17.

I know I can check online weather data sites, but I would also appreciate hearing from people who have been to Croatia and Slovenia in September to hear what kind of weather they had and what appropriate clothing to bring. I don't want to overpack by bringing something that is inappropriate for the season. I know weather can change from year to year, but hopefully it won't be a drastic change. Is September in Croatia still summery, or more autumn like?

If it helps, we are visiting (in this order) Dubrovnik, Split, Plitvice, Zagreb, and Ljubljana with a day trip through the Julian Alps.

Thank you!

Posted by
2687 posts

I know you want to hear form experiences, but for future reference, a website like Wunderground provides historical data for temps and precipitation. You can look at your dates and go back numerous years. Consider many who post here are travelers who may only have been one time and that might have been an anomaly year. 'Averages' are useless as there has been climate change. Thus I used a website with historical data for both heat and rain to determine packing and what to expect.

Posted by
11153 posts

'Averages' are useless as there has been climate change.

This is very important, particularly as many "averages" seem to take data from 2010 and before. Do look at the last few years for your dates on a historical weather website, rather than relying on "averages." And do look at all your places, as I would expect weather on the coast to be different from that inland, and weather at sea level to be different from that in the mountains, particularly in September.

Posted by
3112 posts

I have visited Croatia twice that time of year. Dubrovnik was still quite warm first half of September while temperatures in the north were cooler but not cold. Split was sunny and pleasant. I would pack a light sweater and/or light jacket for cooler days and evenings. A jacket is also useful should it rain.

Posted by
569 posts

Thank you to Maria, Harold, and Frank! I will look at Wunderground. And I understand what you are saying about sea level versus the mountains. Frank, your information is exactly what I was looking for. Will definitely pack a light jacket and/or fleece.

Posted by
1932 posts

Good info. upthread. We were in Slovenia and Croatia the first 3 weeks of September 2018. I recall one late afternoon we had brief light rain in Ljubljana. Other than that we had sunny pleasant weather. A light sweater, or rain jacket would be perfect as needed.

Posted by
1424 posts

In mid September 2017 Slovenia and Croatia (northern) were very pleasant, no rain, not hot. Short sleeved weather daytimes and a light sweater evenings.

Posted by
2 posts

For the visitors who have visited during September, were you able to swim in the beaches during this month?

Thank you in advance!

Posted by
1424 posts

I'm one of the September visitors, but we did not go to any beaches. The weather was certainly warm enough that it would have been pleasant. And we spent lovely evenings outdoors walking on the promenades along the water. But no beaches.

Posted by
1932 posts

Yes, when we were on Korcula in September (our favorite island) it was warm enough to swim. We compared the water temperature to Maui. Also we observed people swimming in Split & Dubrovnik as well. The weather was pleasant.