Sia Kate Isobelle Furler amụrụ na 18 Disemba 1975 na Adelaide, South Australia. Nna ya, Phil Colson, bụ onye egwu, na nne ya, Loene Furler, bụ onye nkuzi nka. Sia bụ nwa nwanne nwoke nke onye na-agụ egwú Kevin Colson. Sia kwuru na dịka nwatakịrị, o ṅomiri ụdị arụmọrụ nke Aretha Franklin, Stevie Wonder na Sting, onye ọ na-ekwu na ọ bụ mmetụta mbụ. Ọ gara ụlọ akwụkwọ Adelaide High School. N'etiti afọ 1990, Sia malitere ọrụ dị ka onye na-agụ egwú na mpaghara acid jazz band Crisp. Sia soro ndị otu ahụ rụọ ọrụ ma nye aka na olu ha na album ha Okwu na Deal (1995) na Delirium EP (1997).
òtù egwú acid jazz nke obodo Crisp