September weather forecastSplit, Croatia

Panorama of Split, Croatia with the view of the Dalmatia waterfront and a distant mountain

September

Weather in September

September brings a gradual decrease in temperature, marking the transition from summer to autumn. Though the sea remains warm, the diminishing sunshine hours can make swimming in the sea less appealing. With an increase in rainfall and frequency of rainy days, the dry spell ends, replacing it with more moist conditions. The shorter daylight signifies the autumn equinox, resulting in shorter days and longer nights. With October coming up next, cooler weather conditions are to be expected.

Temperature

As September commences in Split, the average high-temperature subtly reduces, transitioning from a moderately hot 29.5°C (85.1°F) in August to a still warm 25.1°C (77.2°F). Throughout the month of September, Split sees a steady low-temperature average of 18.1°C (64.6°F).

Rainfall

In Split, in September, it is raining for 7 days, with typically 72mm (2.83") of accumulated precipitation. Throughout the year, in Split, there are 110 rainfall days, and 816mm (32.13") of precipitation is accumulated.

Snowfall

March through December are months without snowfall.

Sea temperature

In Split, the average seawater temperature in September is 23.8°C (74.8°F).
Note: Your comfort in 23.8°C (74.8°F) waters hinges on your relationship with the cold, today's sunny disposition, wind patterns, and the air's temperature. For context, Olympic swimmers are no strangers to waters of 25°C (77°F) to 28°C (82.4°F).

Daylight

In Split, the average length of the day in September is 12h and 30min.
On the first day of the month, sunrise is at 06:18 and sunset at 19:29. On the last day of September, sunrise is at 06:51 and sunset at 18:37 CEST.

Sunshine

The average sunshine in September in Split, Croatia, is 8.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index of 5 during September translates into these guidelines:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Notice! Sand and water reflections contribute to a stronger UV exposure.

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

Frequently asked questions

The high-temperature in Split during September is 25.1°C (77.2°F) and the low-temperature is 18.1°C (64.6°F).

In September, in Split, Croatia, the rain falls for 7 days. Throughout September, 72mm (2.83") of precipitation is accumulated.

In Split, Croatia, snow does not fall in March through December.

In Split, Croatia, the average seawater temperature in September is 23.8°C (74.8°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 23.8°C (74.8°F).

In September, the average day length in Split is 12h and 30min.

In September, on the first day of the month, sunrise is at 06:18 and sunset at 19:29. On the last day of the month, in Split, Croatia, sunrise is at 06:51 and sunset at 18:37 CEST.

The average sunshine duration in September is 8.2h.

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk 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

29.5°C

25.1°C

20°C

Average low temperature

Average rainfall

Average rainfall days

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average UV index

Average temperature in September
Split, Croatia

Average high temperature in September: 25.1°C

The warmest month (with the highest average high temperature) is July (29.8°C).
The month with the lowest average high temperature is January (10.3°C).

Average low temperature in September: 18.1°C

The month with the highest average low temperature is July (21.6°C).
The coldest month (with the lowest average low temperature) is January (5.4°C).

Average rainfall in September
Split, Croatia

Average rainfall in September: 71.9mm

The wettest month (with the highest rainfall) is November (113.7mm).
The driest month (with the least rainfall) is July (28.4mm).

Average rainfall days in September
Split, Croatia

Average rainfall days in September: 7 days

The month with the highest number of rainy days is December (13 days).
The month with the least rainy days is August (5 days).

Average snowfall days in September
Split, Croatia

Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (1 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in September
Split, Croatia

Average sea temperature in September: 23.8°C

The best month for swimming (with the highest average sea temperature) is August (24.8°C).
The coldest month (with the lowest average sea temperature) is February (13.5°C).

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

Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

Average sunshine in September: 8h and 12min

The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).