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April here is a shoulder month in the strict sense: easier than summer on both temperature and crowds, and not yet open. Regulars warn that it is not beach weather - our row gives 19.8C air over a 15.7C sea - that many restaurants wait for May, and, most usefully, that the boats are on a winter timetable. The fast catamaran down to Dubrovnik does not start until May, the Ancona crossing skips the first twenty days of the month, and the island services run a reduced pattern. So an April itinerary has to be built from what is actually sailing. Weather is decent at 45.4mm across 5.6 days and 11.1 hours of sun. The record: 12.9C nights, humidity 70 percent and a 19.3 kph wind.

Regulars are specific this month splits sharply in two, early October still warm enough for swimming while late October brings meaningfully colder conditions and a real chance of the cold northerly bura wind kicking up, swimming largely off the table by then. Our row backs that mild, genuinely wet read, 21.4C over 16.3C nights, with a substantial 130.5mm of rain across 9.2 days and humidity at 75 percent. Regulars are honest a full day of horrendous, unrelenting rain is a real possibility some years, though brilliant blue skies can return again the very next day. Crowds are mostly gone by late in the month without the island feeling completely empty either. The sea sits at a warm 23.1C. The record: 8.7 hours of sun, a 16.3 kph wind and AQI 47.

Regulars describe the land warming up nicely by late April into May, warm enough that sunbathing is common and unusually hot years even bring swimmers, but the sea itself is consistently the slower half of the equation, not reliably warm until mid-May at the earliest. Our row backs the air/sea split, 21.6C over 17C nights, with 94.5mm of rain across 10.9 days, against a sea still at a cool 18.4C. Regulars are clear this is a genuine lag rather than an occasional exception - the water simply takes weeks longer to catch up to the improving air temperature every year. The record: humidity 75 percent, 11.9 hours of sun, a 17.8 kph wind and AQI 53.

September is the month regulars recommend on this island and their reasoning is about lag: the crowds of June and July have gone but the sea is still carrying August's heat, so swimming is as good and sunbathing better for not being too hot. A sweater in the evening, they say, and certainly not a coat. Our row agrees on the sea at 24.5C against 25.5C days and 20.3C nights. It adds the thing the board does not discuss: 116.3mm of rain, which falls across only 8.5 days at fourteen millimetres each. That is the Adriatic September pattern - long fine spells broken by real storms - rather than the drizzle the total might suggest. The record: humidity 71 percent, 10.4 hours of sun and a 16.9 kph wind.

June on this coast is hot without being stifling the way July and August are, and regulars put the beautiful stretch from about mid-month. The number they are most careful about is the water: roughly 21 to 23C in June and only just over 20C in mid-month, against 25 to 28C by late July and August - so the Adriatic in June is swimmable rather than warm. Our row's 23.4C is the month averaged and sits at the top of their range, because it warms as June goes on. Early June is the quiet half. They still suggest packing a light sweater and something waterproof. Our row gives 26.6C days, 21.6C nights and 44.3mm across 5.2 precipitation days. The record: 13.2 hours of sun, 15.3 hours of daylight and AQI 56.