The Slovene participating broadcaster, Radiotelevizija Slovenija (RTVSLO), held the national final Evrovizijska Melodija 2003 in order to select its entry for the contest.

In the second round, "Lep poletni dan" performed by Karmen Stavec was selected as the winner entirely by a public televote.

Its only other top ten result was achieved in 1997 when "Zbudi se" performed by Tanja Ribič placed tenth.

The broadcaster has traditionally selected its entry through a national final entitled Evrovizijska Melodija (EMA), which has been produced with variable formats.

The expert jury and the televote each assigned points as follows: 1-8, 10 and 12, with the top three being determined by the songs that receive the highest overall scores when the votes were combined.

[9] In the second round, a public televote selected "Lep poletni dan" performed by Karmen Stavec as the winner.

[12] The draw for running order had previously been held on 29 November 2002 in Riga, with the results being revealed during a delayed broadcast of the proceedings later that day.

[16] In Slovenia, the show was televised on TV SLO2 with commentary by Andrea F.[17] Televoting was an obligatory voting method for all participating countries.