CPS said 63 percent of seniors are projected to graduate this year, which is up from 61 percent in 2012 , 58 percent in the 2010 - 2011 school year and 44 percent 10 years ago.
Initially, CPS said this year's expected graduation rate was its highest ever, but a spokesperson clarified later that the numbers date back to 1999, when CPS started tracking its data in a different format.
The spokesperson also clarified that the numbers are for a five-year rate, not a four-year rate.
Attendance rates also improved, CPS says, with year-to-date attendance for all students projected at 92.9 percent, an increase of 0.4 percent from last year and 1.2 percent from the prior school year.
According to CPS, over the last two years alone, more than 4,000 more children were attending school regularly.
"While this news is very encouraging, we will continue working hand in hand with parents and school communities to remove barriers to attendance and create safe, positive learning environments for every child regardless of where they live," CPS CEO Barbara Byrd-Bennett was quoted in a news release.
Chicago Public Schools serves 403,000 students in 681 schools and is the nation's third largest school district, according to the release.