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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the WordPatch weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
In September, Croatia still delivers plenty of warmth along the coast, with average highs of 25–28°C in Dubrovnik and Split, though evenings cool to around 18°C. The Adriatic Sea stays pleasantly swimmable, and rainfall increases gradually from mid-month.
Is September a good time to visit the Dalmatian coast?
Yes, it is one of the best balance months. Crowds thin after the August peak, prices for accommodation and flights drop, and the sea temperature lingers around 22–24°C. You can still enjoy long sunny days in Dubrovnik, Hvar and Zadar, but pack a light jacket or jumper for breezy evenings, especially after sunset.
What about the Istrian peninsula and inland Zagreb?
Istria (Pula, Rovinj) stays warm and sunny through early September, with highs near 26°C, while inland Zagreb sees 20–22°C and more cloud. By late September, the chance of a short thunderstorm increases everywhere, so a compact umbrella is wise. September is also excellent for hiking the Plitvice Lakes and Krka National Park, with fewer visitors and milder walking temperatures.
Does it still feel like summer in Dubrovnik during September?
Yes – early September especially. Daytime temperatures often reach 28°C, and the sea is warm for swimming. By late September, a light breeze picks up and evenings need a thin layer, but it remains far more comfortable than the July–August peak.
Is September too risky for a beach holiday in Croatia?
Not at all. The first two weeks are typically stable and sunny. Rain usually arrives as short afternoon showers rather than prolonged downpours. For the best sun odds, pick the first half of the month and stay on the southern coast.
How does Croatia weather in September compare to October?
September is distinctly warmer and drier. October sees average highs drop to 19–21°C, more frequent rain and shorter days. If you want sea swimming, September is the last dependable month; by October, many coastal resorts wind down.
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Plan your trip with our UK weather hub or see how other destinations compare in Crete Weather and Malta Weather. For travellers weighing up later autumn, check Rome Weather for similar Mediterranean patterns.