On-campus crime rates are pretty easy to research. What is more difficult to find out about is off-campus crime that is not reported by the schools. The following website tracks crime in Philadelphia. You can see a nice red “hotspot” right over Temple’s campus.
http://data.inquirer.com/crime/heatmap/
Penn and Drexels’ campus seems to have a lot of crime as well, although not at the same levels as Temple.