Search continues for 20yo missing in surf

A father who desperately tried to rescue his son from rough surf off Victoria's coast has been discharged from hospital while the young man remains missing.

The search for the North Melbourne 20-year-old continued on Sunday with the help of police, the Air Wing, search and rescue teams, the State Emergency Service and Life Saving Victoria.

The man went missing off Gunnamatta surf beach on the Mornington Peninsula on Friday night when he and his 16-year-old brother got into trouble in the surf.

The father went in after his sons, and rescuers managed to pull him and the teenager from the water. The older son could not be found.

There was heavy swell and strong winds at the time, police said.

The rescued father and teenager were taken to Frankston Hospital with non-life threatening injuries.

The 16-year-old was discharged on Saturday according to police, but the father had to remain there.

As of Sunday morning, the father - aged in his 40s - had also left hospital.