If you are trying to find out, the best period to visit Split in Croatia, my opinion might seem too subjective as Split is my hometown.
I can assure you it’s worth a visit at any time, but it all depends on your expectations and interest when you decide to visit this town.
Planning a vacation is always a fun, but knowing in advance Split weather conditions will be important to decide when to go to Split Croatia.
I do prefer to talk about weather on wider geographic area including the whole Split-Dalmatia County is case you are interested in Dalmatia islands hopping even, fundamentally the climate conditions are more or less equal in the whole area.
While the most of the guidebooks recommend visiting Dalmatia only in the summer, Split has enough things to do and places to see to deserve to be visited in winter too.
Split in June is another peaceful month. The days are getting longer and
each day is warmer and warmer. Schools are still open until June 15.
These two months are peak tourist season in Croatia. Usually the most visitors complain about the crowds as the most of tourists invade Split.
In September, Split turns into a different town. Instead of the daily hustle and bustle of August, city begins to live a more peaceful pace.
October together with May, are called 'low season'. The
weather can sometimes be unpredictable but still sunny and warm called 'Indian summer'.
Considering all above periods, from climatic point of view, the best months to visit Split town and county islands are May, June, July, August and September. But looking at this data in terms of price, the number of tourists, things look different.
Without thinking twice I would recommend, late spring or early autumn followed by summer, while winter is good in Christmas time, Carnival in February and March around Easter.
My favorite months are May, June (tourist season getting warmed up, prices are affordable, days are getting long and progressively sunny) and September and October when number of visitors decreases but the days are still favorable for swimming or cruising. I personally open my swimming season on 1st of May.