The explosions on July 14 began shortly before the evening iftar meal that ends the daylong Ramadan fast.
At least eight people were reported killed in the southern port city of Basra in a series of bombs.
Blasts were also reported in Karbala, Kut, Nasiriyah, and Musayyib.
It was the fourth day in a row in which more than 30 people were killed in attacks.
Iraq is in the midst of its worst wave of violence in years, raising fears that the country could be heading back toward widespread sectarian fighting.
On July 13, more than 20 people were killed in bomb attacks that targeted Sunni mosques in Baghdad.