Melbourne's ongoing wet weather has forced the AFL to move their two grand-final curtain raisers from the MCG.

The AFL is worried about the state of the MCG surface for the main match between St Kilda and Geelong.

The AFL announced late on Friday afternoon that they moved the two under-16 championship grand finals to the Princes Park ground.

Queensland will play NSW/ACT from 9am in the division two final and Victoria Country will meet South Australia at 10.50 in the division one game.

The times will be the same as the original schedule at the MCG, so the players and their families can go to the AFL grand final.

"The AFL grand final is our showpiece match for the season and the two teams must have the best possible surface to contest the premiership," league chief executive Andrew Demetriou said in a statement.

"We understand the competing teams in the under 16s will be extremely disappointed, along with their families and support staff, but we must take this decision to move the two matches for the most important match of the 2009 year."

The forecast for Saturday in Melbourne is showers becoming more frequent during the afternoon, with the chance of thunderstorms and hail.

A big crowd turned out in the Melbourne CBD for Friday's grand final parade, despite wet weather.

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