September weather forecast
Ljubljana, Slovenia

In September, major shifts in weather patterns can be observed in Ljubljana. Despite the rainfall accumulates to 147mm (5.79"), a significant drop in temperate is noticed from the peak summer temperatures. It is also marked by a decrease in sunlight hours, a strong indication of the ongoing transition towards autumn. The UV index dwindly intensifies by 5, making outdoor exploration more comfortable. Nature begins to put on a show of colors, as trees start to shed their summer green in favor of autumn hues.

Temperature

September in Ljubljana brings a minor decrease, with the average high-temperature reducing from a warm 26.7°C (80.1°F) in August to a pleasant 21.6°C (70.9°F). September nights cool down to an average low-temperature of 11.5°C (52.7°F).

Rainfall

The months with the most rainfall are September and October, with an average 147mm (5.79") of precipitation.

Daylight

In September, the average length of the day is 12h and 32min.
On the first day of the month, sunrise is at 06:23 and sunset at 19:40. On the last day of September, sunrise is at 06:59 and sunset at 18:43 CEST.

Sunshine

In Ljubljana, the average sunshine in September is 6.1h.

UV index

In Ljubljana, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, the UV index of 5 transforms into the following advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.