The seven car bombs and two roadside bombs, which hit six different areas of Baghdad, also wounded more than 60 people, the sources said.
The deadliest single attack was a car bomb in the Karrada district in central Baghdad that killed at least three people and wounded at least 10.
Baghdad, one of the most frequently-targeted cities in the country, is hit by near-daily bombings and shootings.
Sunni jihadists often target members of Iraq's Shiite majority, whom they consider apostates.
Violence in Iraq has killed more than 1,790 people since January 1, according to AFP figures based on security and medical sources.