September weather forecast
Split, Croatia

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.