McMillan's first carry came late in the third quarter after starter Josh Davis left the game due to an apparent left leg injury. McMillan scored a 43-yard run on the first play of the fourth quarter to tie it at 16. Davis ran 18 times for 68 yards for the No. 3 Wildcats (4-0, 4-0 Big Sky Conference).
Kyle Thompson's 19-yard field goal gave Weber State a 19-16 lead with 10:02 remaining.
The Thunderbirds (1-4, 1-4) forced a fourth down on Weber State's final drive but Southern Utah had 12 players on the field when the Wildcats were attempting a punt, giving Weber State a first down and the ability to run out the clock for the win.
La'akea Kaho'ohanohano-Davis blocked a punt and returned it for a touchdown to give Southern Utah a 6-3 lead late in the second quarter. Justin Miller's 1-yard sneak gave the Thunderbirds a 16-9 lead late in the third quarter.
Weber State won for the third straight time by five or less points.
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