Board members voted on the appointment Wednesday evening.
Ray is currently assistant superintendent of academic operations and school support at SCS, according to the district's website.
He started as a teacher at Kirby Middle School and worked his way up through the district. He said he intends to apply for the permanent position.
Superintendent Dorsey Hopson is leaving the job to work in the private sector Jan. 8. Ray will work with him through the transition.
Tuesday, Hopson presented the board with his recommendations for school closings and construction. It's not known whether Ray will continue pursuing Hopson's recommendations.