The song received a mixed reception from music critics and was released as a single on July 13, 2003, the second song to precede the release of Pure. A moderate success, it reached number 16 in Austria and number 26 in Switzerland, while it charted at number five on the German Singles Chart where it became the No Angels's seventh non-consecutive top five single. Katja Kuhl directed a music video for "Someday" near the Le LucFormula One racing track in Var in southeastern France which features a love story between band member Vanessa Petruo and a male racing driver. The band premiered "Someday" during an acoustic concert in Munich club P1.
After Jessica Wahls' pregnancy break from the group and the end of the Four Seasons Tour, the remaining four members of the No Angels began intensifying work on their then-untitled third studio album. Encouraged to exercise more self-control on the longplayer after their critically acclaimed contribution on predecessor Now... Us!, the band took over responsibility in composing, recording and selecting songs to guarantee a more personal theme on the album — a step that challenged criticism and growing scepticism among the band's label Cheyenne Records and recording company Polydor. "Someday" was written by Swedish musicians Thomas Jansson and Niklas Hillbom, while production was helmed by frequent collaborator, German producer Thorsten Brötzmann. Recorded at Department Studios in Frankfurt am Main, it was mixed by Jeo, while vocal recording was overseen by Klaus Üblacker.Keyboards were handled by Michael Knauer, Stefan Hansen, Jeo and Brötzmann, while guitars were played by Peter Weihe. One of the first songs recorded for Pure, No Angels first performed "Someday" at an acoustic concert in Munich club P1 in spring 2003.
The song was covered by entertainer Belinda. The song recorded is a version in Spanish, called "Lo Puedo Lograr" (I Can Get It). It was also covered by French "singer" Eve Angeli, in french language, entitled "Sans Toi" (Without You).