The bombs struck four Shiite-majority areas of the Iraqi capital and a confessionally mixed area just to its north, the officials said.
The deadliest attack was in the Sadr City area of north Baghdad, where a car bomb killed at least three people and wounded at least 10.
Militants have carried out a string of sectarian attacks in central Iraq, raising the spectre of a return to the all-out Sunni-Shiite conflict that peaked in 2006-2007 and killed tens of thousands of people.
On Friday, bombs exploded near two Sunni mosques in Baghdad as worshippers left after prayers, killing six people.
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Another bombing targeted Sunni mourners in Baghdad on September 23, killing 15 people, while an attack on a Sunni funeral killed 12 the day before.
Bombings targeting Shiite mourners killed 73 people in Baghdad on September 21, and two blasts at a Sunni mosque north of the capital killed 18 a day before that.
The latest bloodshed brings the September death toll to more than 800, according to AFP figures based on security and medical sources. Upwards of 4,600 have been killed so far this year.