Weber State (22-5, 16-2 Big Sky) led 37-29 at halftime but the Lumberjacks used a 20-5 run to begin the second half capped off by a Gabe Rogers 3-pointer to give Northern Arizona a 49-42 lead with 8:32 remaining in the game.
Trailing 69-67 with 11 seconds left, Berry hit a pair of free throws to send it to overtime and the Wildcats scored the first seven points in overtime to hold off Northern Arizona (11-18, 8-10).
Rogers finished with 25 points while hitting six 3-pointers to lead the Lumberjacks. DeWayne Russell had 17 points, seven assists and six rebounds. Max Jacobsen finished with 17 points.
Weber State shot 47.3 percent from the field and was 19 of 23 from the free-throw line.
The second annual Gavitt Tipoff Games, eight games between members of the Big East and Big Ten to be played Nov. 14-18, will feature Villanova at Purdue in the opener.
Michael Lewis is leaving his assistant coaching job at Butler to take the same position at Nebraska under Tim Miles.
College basketball fans should be excited about next season's Jimmy V Classic, an event that will feature Duke's heralded freshman class.