For swimming, the Zadar area is at its best from mid-June to the end of September, when the sea is 23–25 °C. If you want warm water without the crowds and at lower prices, aim for the second half of June or September. July and August are the hottest and most expensive months; April, May and October suit hiking and the national parks; winter is quiet and cheap but most seaside restaurants are closed.
The table shows long-term averages for Zadar (climate normals, rounded); Sukošan and Biograd are practically identical. A typical summer runs a degree or two above these figures, and shallow bays reach 26–27 °C in August.
| Month | Air day / night | Sea | Season and prices | What is open |
|---|---|---|---|---|
| January | 11 / 5 °C | 13 °C | off-season, cheapest | towns yes, resorts barely |
| February | 11 / 5 °C | 12 °C | off-season | as January, carnival |
| March | 14 / 7 °C | 13 °C | off-season | first konobas reopen, Easter |
| April | 18 / 10 °C | 15 °C | low, cheap | parks, day trips, most apartments |
| May | 22 / 15 °C | 19 °C | low to mid | almost everything, first swims |
| June | 27 / 19 °C | 23 °C | mid, high from about 20 June | everything, boat trips |
| July | 30 / 21 °C | 25 °C | high, most expensive | everything, busy |
| August | 29 / 21 °C | 25 °C | high, most expensive | everything, busy |
| September | 25 / 17 °C | 23 °C | mid, low from mid-month | almost everything until month end |
| October | 21 / 13 °C | 20 °C | low | parks yes, konobas closing |
| November | 16 / 10 °C | 17 °C | off-season | towns, very few trips |
| December | 12 / 6 °C | 15 °C | off-season | Advent in Zadar |
Rainfall peaks in September and November (around 120 mm a month) and is lowest in July (about 35 mm). September rain comes as short storms, though, and you still get 8–9 hours of sunshine a day.
From roughly 20 June to the end of August everything is at its dearest: a family apartment for four around Zadar typically costs €60–120 a night in 2026, Krka and Plitvice charge their summer rate of €40 per adult, and zone-1 parking in Zadar runs about €1.60 an hour. The town beaches in Zadar and Biograd are packed from 10 am to 5 pm, and the A1 motorway queues at the Sveti Rok tunnel on Saturdays.
The upside is real: the sea is 25 °C and the nights stay warm, every konoba, rental shop and excursion boat is running, and island ferries have their densest timetable. If school holidays are your only option, pick a smaller place with its own parking – see Sukošan or Biograd with kids? Beaches, prices and evenings compared – and book by March; by June the good apartments are gone.
For anyone not tied to school dates, September is the obvious answer. The sea holds 23–24 °C after the summer (about 22 °C by month end), daytime highs are 24–27 °C and evenings are warm enough to eat outside. Accommodation prices usually drop 20–40 % after 1 September and further from mid-month, and hosts are happier to accept stays shorter than a week. Konobas, boat rentals and Kornati trips run to the end of the month, and you can actually park in Zadar in the daytime.
Two things to know: Krka and Plitvice keep their summer ticket price until 30 September, the tourist tax is also on the summer rate until the end of September, and the first autumn storms usually arrive around 10–20 September – the air cools a few degrees afterwards, but the sea stays warm.
May is the best month for Paklenica, Krka, Plitvice and cycling around Vrana Lake: 20–24 °C by day, mid-season tickets (Krka €20, Plitvice €23.50) and half-empty trails. The sea is 18–20 °C – fine for a brave dip and for toddlers in the shallows, but not yet a beach holiday. Apartments cost 40–60 % of the summer rate.
The first half of June is a quiet tip for families with pre-school children: the sea is already 22–23 °C, beaches are half empty and prices are still mid-season. October mirrors May – 19–21 °C in the sea early in the month, ideal hiking weather, but many coastal konobas and excursion boats have closed. Which park to choose with limited days is covered in Narodne Parky Pri Zadare.
Winter around Zadar is mild (10–14 °C by day) but windy – the bura can stop ferries and close the A1 at Sveti Rok for two or three days. Zadar itself keeps its market, cafés and most restaurants going; in Sukošan and Biograd only a handful of places stay open. Accommodation costs a fraction of the summer price and many owners offer monthly rates. Park tickets are on the winter rate (Krka €7, Plitvice €10), and the waterfalls are at their fullest. Details in Winter on the Adriatic: Weather, What's Open and Long Stays in Zadar.
Mistakes we see every year: arriving in October with swimwear and expecting the summer excursion programme; booking a July apartment in May and finding only the priciest ones left; and September families not checking whether the pool or playground at their apartment is still open on their dates.
On Adrysa you deal directly with the owner, so you can agree things a booking engine cannot – a four-night stay in June, a discount for two weeks in September or a later arrival after a storm. Browse apartments in Zadar and in Sukošan or the full list under commission-free accommodation. What a week costs in each season is worked out in Rozpocet Dovolenka Chorvatsko.