Michał Winiarski was born in Bydgoszcz, Poland. He graduated from the Sports Championship School in Spała. He studied at the Management and Administration College in Opole. On 13 May 2006, he married Dagmara (née Stęplewska). On 28 November 2006, their son Oliwier was born. On 13 March 2014, his wife gave birth to their second son, named Antoni.
With AZS Częstochowa, Winiarski is a two–time bronze medallist of the Polish Championship (2004, 2005). He spent the 2005/2006 season as a player of BOT Skra Bełchatów, and won the Polish Championship and Polish Cup with this team. From 2006 to 2009, he played for Italian team Itas Diatec Trentino. With this team, he won the 2008–09 CEV Champions League, and was also named the Best Blocker of the tournament. He has a gold (2008) and silver (2009) medal from the Italian Championship. In 2009, he returned to PGE Skra Bełchatów. They won the Polish Championship in 2010, and 2011. He has a silver medal at the Club World Championship in 2010. In 2010, PGE Skra Bełchatów, including Winiarski, won a bronze medal of the CEV Champions League. They improved this result in 2012, when they won a silver medal of the CEV Champions League, after a match against Zenit Kazan at the Final Four held in Łódź, Poland.[3] Michał Winiarski was named the Best Receiver of the tournament. In 2013, he signed a 2–year contract with Russian team Fakel Novy Urengoy, but eventually he only spent one season in Russia.[4] On 16 June 2014, it was officially announced that Winiarski is returning to Bełchatów, and had signed a two–year contract with PGE Skra Bełchatów.[5] On 8 October 2014, his team won the Polish SuperCup. On 7 February 2016, he won the Polish Cup after beating ZAKSA in the final.[6] After the 2016–17 PlusLiga season, Winiarski decided to end his volleyball career.
In 2003, he captained the Polish national volleyball team to a gold medal at the U21 World Championship. He debuted as a senior national team player on 7 January 2004, in a match against Russia. In 2006, he took part in the World Championship, where the Polish team finished 2nd. During the course of the Poland–Brazil match for the gold medal, his first son was born. In 2008, he took part in the Olympic GamesBeijing 2008, where Poland came in fifth, and Winiarski received an award for the Best Receiver of the tournament. In 2011, he and the rest of his national team, won a silver medal at the World Cup.[7] On 8 July 2012, the Polish national team won a gold medal at the 2012 World League with the final tournament held in Sofia, Bulgaria.[8][9] In May 2014, Winiarski was chosen as the new captain of the national team, replacing the previous one, Marcin Możdżonek.[10] On 21 September 2014, Poland, with Winiarski as the captain, won a title of the World Champions.[11][12][13] On the same day, Winiarski announced his retirement from the national team.
2008–09 – with Itas Diatec Trentino
2011–12 – with PGE Skra Bełchatów
Polish Cup, with BOT Skra Bełchatów
Polish Championship, with BOT Skra Bełchatów
