The service for family and invited guests will be held at Swansea Minster Church at 1 p.m. Swedish time. It will be broadcast live on the star's official website, while fans can follow it on large screens outside the church, writes the BBC.
A major focus will be on Tyler's Welsh identity, and the organist will play songs by Tom Jones, Shirley Bassey and Tyler herself before the ceremony.
A male choir will also sing Tyler's big hit "Total Eclipse of the Heart".
The procession then moves on to nearby Skewen in Neath Port Talbot, where Tyler was born and raised, for a private family ceremony.
Tyler died in early July in a hospital in Portugal after a short illness. She was 75 years old.
