According to rescue sources, a man was electrocuted in a house near Bengali turn in Gulshan-e-Maymar.
The body of the deceased was taken by ambulance to a nearby hospital and then to Edhi morgue.
On the other hand, the roof of a house in Orangi Town collapsed due to accumulation of water in the house, killing one woman and her three children.
An injured child has been taken out of the wreckage and shifted to the hospital, while all the four bodies have also been shifted to the hospital.
The Meteorological Department has forecast rain with thunderstorms and strong winds in Karachi till September 11.