Obama ordered federal aid to supplement state and local recovery efforts in Atlantic, Cumberland and Salem counties.
The counties were battered by a line of severe thunderstorms which downed trees, power lines and poles, sparked fires and destroyed some homes.
Two people were killed when a tree fell on their tent in a Salem County state park.
A preliminary damage assessment put the cost at more than $17 million for the three counties.
Federal funds will be available to state and local governments and certain nonprofit private organizations.