September weather forecastDubrovnik, Croatia

The fortresses of Dubrovnik in Croatia, set on rocks surrounded by calm, clear waters

September

Weather in September

September experiences a gradual cooling in Dubrovnik as the weather shifts towards autumn. Despite this, the month presents conditions resembling that of a mild summer, where sunlight hours remain relatively high. Rainfall starts to increase, with September seeing an apparent rise from the preceding month, amounting to 54mm (2.13"). Beach visits continue to be a popular activity as sea temperatures sustain an inviting warmth for visitors.

Temperature

September's onset in Dubrovnik introduces a mild reduction in the average high-temperature, from 27.9°C (82.2°F) in August to a still warm 23.4°C (74.1°F). Throughout the month of September, Dubrovnik expects an average low of 18.2°C (64.8°F).

Humidity

In September, the average relative humidity in Dubrovnik, Croatia, is 64%.

Rainfall

In September, in Dubrovnik, the rain falls for 9.9 days. Throughout September, 54mm (2.13") of precipitation is accumulated. Throughout the year, there are 134.6 rainfall days, and 827mm (32.56") of precipitation is accumulated.

Snowfall

In Dubrovnik, snow does not fall in January, March through December.

Sea temperature

In Dubrovnik, Croatia, the average seawater temperature in September is 24.3°C (75.7°F).
Note: Taking into account a person's sensitivity to the cold, given sunshine, wind, and air temperature, swimming in 24.3°C (75.7°F) might be pleasant. (FYI: The water temperature set for the Olympic swimming event is between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In Dubrovnik, the average length of the day in September is 12h and 29min.
On the first day of September, sunrise is at 06:13 and sunset at 19:21. On the last day of the month, sunrise is at 06:44 and sunset at 18:30 CEST.

Sunshine

In September, the average sunshine is 10.4h.

UV index

The average daily maximum UV index in September in Dubrovnik is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Take precautions - Protection against skin and eye damage is obliged. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Alert! The Sun's UV rays are heightened by the reflection of sand and water.

Updated: Jan 24, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In Dubrovnik, 23.4°C (74.1°F) is the average high-temperature and 18.2°C (64.8°F) is the average low-temperature during September. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is appraised at 30°C (86°F).

In September, the average relative humidity in Dubrovnik, Croatia, is 64%.

In Dubrovnik, in September, it is raining for 9.9 days, with typically 54mm (2.13") of accumulated precipitation.

January, March through December are months without snowfall in Dubrovnik.

In Dubrovnik, in September, the average water temperature is 24.3°C (75.7°F). For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 24.3°C (75.7°F).

In Dubrovnik, the average day length in September is 12h and 29min.

In September, on the first day of the month, sunrise is at 06:13 and sunset at 19:21. On the last day of the month, in Dubrovnik, Croatia, sunrise is at 06:44 and sunset at 18:30 CEST.

The average sunshine duration in September in Dubrovnik is 10.4h.

In Dubrovnik, Croatia, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

27.9°C

23.4°C

19.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.3km/h

12.5km/h

13.6km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

21.4

18.1

19.5

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Dubrovnik, Croatia

Average high temperature in September: 23.4°C

The warmest month (with the highest average high temperature) is August (27.9°C).
The month with the lowest average high temperature is January (9.4°C).

Average low temperature in September: 18.2°C

The month with the highest average low temperature is August (21.8°C).
The coldest month (with the lowest average low temperature) is January (5.8°C).

Average pressure in September
Dubrovnik, Croatia

Average pressure in September: 1016.1mbar

The month with the highest atmospheric pressure is December (1019.2mbar).
The month with the lowest atmospheric pressure is July (1013.9mbar).

Average wind speed in September
Dubrovnik, Croatia

Average wind speed in September: 12km/h

The windiest month (with the highest average wind speed) is February (16.8km/h).
The calmest month (with the lowest average wind speed) is August (10.5km/h).

Average humidity in September
Dubrovnik, Croatia

Average humidity in September: 64%

The month with the highest relative humidity is February (73%).
The month with the lowest relative humidity is August (62%).

Average rainfall in September
Dubrovnik, Croatia

Average rainfall in September: 54mm

The wettest month (with the highest rainfall) is November (165mm).
The driest month (with the least rainfall) is July (22mm).

Average rainfall days in September
Dubrovnik, Croatia

Average rainfall days in September: 9.9 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is August (5.4 days).

Average snowfall in September
Dubrovnik, Croatia

Average snowfall in September: 0mm

The month with the highest snowfall is February (3mm).
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in September
Dubrovnik, Croatia

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in September
Dubrovnik, Croatia

Average sea temperature in September: 24.3°C

The best month for swimming (with the highest average sea temperature) is July (25.5°C).
The coldest months (with the lowest average sea temperature) are January and February (14.2°C).

Average daylight in September /
Average sunshine in September
Dubrovnik, Croatia

Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

Average sunshine in September: 10h and 24min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).

Average sunshine days in September
Dubrovnik, Croatia

Average sunshine days in September: 18.1 days

The month with the most sunshine days is August (21.4 days).
The month with the least sunshine days is May (13.8 days).

Average UV index in September
Dubrovnik, Croatia

Average UV index in September: 5

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover in September
Dubrovnik, Croatia

Average cloud cover in September: 18

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 10).

Average visibility in September
Dubrovnik, Croatia

Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).