Career
Weckström first represented Finland at Olympic level at the 2000 Summer Olympics in Sydney. She reached the second round before losing to Kanako Yonekura of Japan. Weckström played badminton at the 2004 Summer Olympics, losing to Kaori Mori of Japan in the round of 32.
At the 2008 Olympics, she again reached the second round, this time losing to Huaiwen Xu of Germany.
She competed in badminton at the 2012 Summer Olympics but did not advance beyond the group stages. Anu"s husband is tennis professional Jarkko Nieminen.