The following warming stations were listed on the Fulton County and City of Atlanta websites. The listings have the hours posted for each location, but they say they will change availability based on conditions so they can be open outside the posted hours.
Central Park Recreation Center 400 Merritts Ave NE Atlanta, GA 30308 Open 8p-6a
Old Adamsville Recreation Center 3404 Delmar Lane NW Atlanta, GA 30331 (overflow location)
Burdett Park 2945 Will Lee Road Atlanta, GA 30349 Open 10a-7p
Welcome All Park 4255 Will Lee Road Atlanta, GA 30349 Open 7a-7p