(CNN) The August heat is proving a killer in Philadelphia.

The heat is being blamed as contributing factor in the deaths of at least four people, all of whom were suffering from other medical issues, Jeff Moran of the city's Public Health tells CNN.

-- A 72-year-old man from West Philadelphia, who also had diabetes, hypertension and obesity, died Monday.

-- A 59-year-old man died Sunday. He previously suffered from diabetes and congestive heart failure.

-- A 67-year-old woman from the Port Richmond neighborhood who had diabetes and congestive heart failure died between Thursday and Saturday.

Read More