Weather in Croatia in September

September climate overview

Daytime highs across Croatia in September run from 22.7°C (Pula) to 24.3°C (Dubrovnik). Even in Dubrovnik only 42% of days reach 25°C. Nights average 17.6°C; the coldest 10% of nights in Pula fall to 15°C or below.

Rainfall in September

Expect around 9 rainy days (1 mm or more) in September, with Cavtat the driest (7 days) and Pula the wettest (10 days). The wettest September at Dubrovnik between 1991 and 2020 was 2014 with 292 mm; the driest was 2018 with 12 mm.

Sea temperature

The sea averages 23.1°C around Croatia in September - warmest at Dubrovnik (23.6°C). That is comfortable for swimming.

Sunshine and daylight

Around 7.5 hours of sunshine a day on average, out of 12.3 hours of daylight (sunshine estimated from cloud cover).

September against the rest of the year in Croatia

September is the 4th warmest month of the twelve in Croatia. It is 4.6°C cooler than August and 4.3°C cooler in October. The hottest month here is August (28°C) and the coolest January (10°C).

Which part of Croatia in September?

• Most sunshine: Cavtat, 7.9 h a day.
• Driest: Cavtat, about 7 rainy days.
• Warmest sea: Dubrovnik, 24°C.
• Hottest: Dubrovnik, 24°C by day.
• Coolest (better for walking and cities): Pula, 23°C.

What to pack for Croatia in September

Based on the averages: light layers - warm in the sun, cooler in the shade; a light jumper for evenings (18°C at night); a rain jacket - roughly 9 wet days; swimwear - the sea is 23°C.

Similar weather elsewhere in September

Within 1.5°C of Croatia's September daytime average: Kefalonia (25°C, sea 25°C), Fuerteventura (25°C, sea 23°C), Puglia (25°C, sea 24°C), Lisbon (25°C, sea 19°C), Florence (25°C). See the full ranking for September.

Which part of Croatia should you choose?

For a swimming-focused stay, Cavtat has the strongest combination in these figures: the sea averages 24°C and there are 7 rainy days. Dubrovnik matches that sea temperature but has 9 rainy days, so Cavtat gets the edge if rain is your main concern, not a guarantee of drier weather during your stay. Split is just as warm by day at 24°C, but its 22°C sea makes swimming a cooler prospect. Pula has the lowest daytime average at 23°C and the most rainy days at 10. The air temperature differences are small; sea warmth and your willingness to work around rain are more useful deciding factors. These comparisons cover the coast, rather than inland Croatia.

What to pack and how to plan your days

Pack light clothes for daytime, a light layer for evenings and a waterproof for wet spells. Nights average 18°C nationally, with Split slightly cooler at 17°C, so do not plan on staying in beachwear after dark. Average sunshine of 7.5 hours supports plenty of outdoor time, but it does not promise clear skies throughout your stay. Keep swimming and other outdoor plans flexible rather than assigning them to fixed days. In Dubrovnik, 42% of days exceed 25°C, so the daytime average should not be read as a ceiling. On warmer days, shade at midday and sun protection remain sensible, even though this is not consistently hot weather.