The former president will join Crist at 6 p.m. in downtown Miami at the J.W. Marriott Marquis Hotel at an event open to the public.
"He’s [Clinton's] better than anyone at explaining why what we’re doing matters. I’m looking forward to kicking off the final two months of this campaign with him," Crist said when announcing the event Saturday.
Crist won the Democratic nomination last week his quest to defeat current Republican Florida Gov. Rick Scott in November's general election.
Scott and Crist are virtually tied right now, according to a Huffington Post chart tracking 42 polls on the race.
Crist, who began his political career as a Republican, was Florida's governor from 2007 to 2011. After losing a Republican Senate primary in 2010, he ran unsuccessfully as an independent and later switched to the Democratic Party.