Weather in Dubrovnik in September

How September compares

September is the 4th warmest month of the year in Dubrovnik and ranks 104th of 134 destinations we compare for September - see where else is hot in September. Within Croatia it is 1st of 4 (Croatia in September). Against London's average high of 18.6°C in September, Dubrovnik is 5.7°C warmer by day and 6.5°C warmer at night.

Daytime and night-time in September

The typical September day in Dubrovnik peaks at 24.3°C, but that is an average: the warmest 10% of days reach 27.9°C or more. Roughly 1 in 2 days top 25°C and 1 in 37 pass 30°C. Nights average 17.7°C; one night in ten drops to 14.2°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest September day here reached 32.4°C (2015-09-19) and the coldest night 10.6°C (1995-09-30).

Rain in September

Wet (more than 8 rainy days): about 9 days with 1 mm or more, 138 mm in total. Year to year it varies a lot - the wettest September was 2014 with 292 mm, the driest 2018 with 12 mm. Humidity averages 72%.

Sea temperature in September

The sea averages 23.6°C - warm enough to swim (22°c+). Depending on the year it ranges from 22.4°C to 25.1°C. For the warmest sea here, come in August (25.6°C).

Sunshine and daylight

Around 7.7 hours of sunshine a day (estimated from cloud cover), 12.3 hours of daylight: the sun rises about 06:27 and sets about 18:58 local time in mid-September. Average cloud cover is 37%.

Is September a good time to visit Dubrovnik?

Yes - it is one of the better months: warm days, manageable rain and long sunny days. The best months for Dubrovnik on our scoring are August, July, June; months averaging 25°C or more: Jun, Jul, Aug.

Warm days, with a layer for evenings

September feels warm rather than consistently hot, which suits travellers who want to spend time outdoors without planning everything around intense heat. Days reach 25°C about 42% of the time, while 30°C is much less common, at 3%. Light clothing is a sensible starting point, but keep sun protection handy and take a break from the sun at midday if it feels uncomfortable. Evenings call for more flexibility: the average night low is mild, but the coldest nights can reach 14.2°C or lower. Pack a jumper or light jacket rather than assuming daytime clothes will keep you comfortable after dark.

Plenty of sunshine, but allow for wet weather

Rain is the main compromise, so September is less suited to a trip that depends on being outdoors every day. There are about 9 rainy days during the month, making a light waterproof and shoes you can comfortably wear in wet weather sensible additions to your bag. That does not mean the month is generally grey: average sunshine is about 7.7 hours a day within 12.3 hours of daylight. Keep swimming and longer outdoor plans flexible rather than tying them to a fixed day. If guaranteed dry weather is your priority, the wet outlook is a reason to be cautious; if you can adapt, there is still useful warmth and sunshine.