In August 2023, major floods occurred in large part of Slovenia and neighbouring areas of Austria and Croatia due to heavy rain.

This extra water in the system meant that floods and major river overflows were caused by downpours that crossed Slovenia on the night of 3–4 August.

[5] ARSO issued a red warning for north-eastern, north-western and central Slovenia due to prolonged downpours, which was put into effect at midnight on 4 August.

Two elderly Slovenes drowned in flooded rivers, and two Dutch men, aged 52 and 20, who had hiked to Mount Veliki Draški vrh, were also killed.

In so doing, they pumped water from flooded buildings, covered triggered avalanches, and removed debris and vehicles that had been swept away.

[3] In the settlement of Bistričica, an elderly person was allegedly carried away by torrential flooding, but the exact cause of death is not yet known.

All transit connections to the Kanomlja valley have been cut off, and rescue service interventions in the wider Idrija area were complicated by impassable roads.

Luče, Mežica, Dravograd, Laško, Mozirje, Nazarje, Gornji Grad, Škofja Loka, Šoštanj, Florjan, Topolšica, Celje, Begunje na Gorenjskem and Poljče were also flooded.

[14] In Ljubno ob Savinji, the rising river washed away three houses, people were evacuated to the local elementary school.

[16] Several roads, both regional and local, were also closed, mainly due to collapse of the carriageway, landslides, deposits of sand and mud or high water on the roadway.

[9] Due to the floods in Begunje in Gorenjska, operations were disrupted, and the hospital administration began to search for suitable places to relocate patients.

Beside professional humanitarian agencies like International Red Cross (IRC) and Slovenska Karitas there was IPO Slovenija which was one of the first to start and at the end in 30 days managed to gather and distribute record-breaking 415 tons of aid to the victims of floods.

[23] Water was being pumped out of a dam in the Viktring district of Klagenfurt, Carinthia, after concerns are raised over its stability and could break.

In the Drnje municipality near the confluence of Mura and Drava, a century-old high-water record was broken by more than half a metre (2 ft).

Water flowed through a railway embankment and flooded a large area with a 4–5-metre (13–16 ft) wave, including Lake Šoderica in Legrad municipality.

[33] The Sava course downriver of Zagreb, after Rugvica, is vulnerable due to the almost flat terrain, and was defended by sandbags and flooding retention areas such as Lonjsko Polje.

Using high resolution data from ECWMS Reanalysis v5 a study from the University of Bologna found hints to a secondary peak in cyclogenesis during the summer, additionally to spring.

[36] The storm was named Petar, and moved from the Mediterranean via Italy, Slovenia, Austria, northwards to Germany, Poland and the baltic sea.