Police search for four teenagers missing off Victoria’s Mornington Peninsula

A search is under way for four teenagers missing in waters off Victoria's Mornington Peninsula.

An 18-year-old woman, two 18-year-old men and a 19-year-old woman were using inflatable paddleboards off Rosebud beach on Monday, Victoria police said.

Their belongings were found on the beach just off Point Nepean Road by a passerby about 8pm.

A man who said he was the father of one of the boys told Seven's Sunrise program on Tuesday the teens had just completed their final school exams and were in Rosebud for an end-of-year celebration.

Police and ambulance helicopters, water police and local rescue boats scoured the area for the group overnight but the search was halted at 4am due to deteriorating conditions.

It started up again at daybreak.

Family members of the missing teenagers are believed to be helping with the search.

Rosebud is a popular summer tourist destination. Its main beach faces into Port Phillip Bay, approximately 25km from where the bay opens out into Bass Strait.