Frank Otis added 12 points for the Wildcats (13-3, 8-0 Big Sky), who have beaten Sacramento State 11 straight times.
Sacramento State was within 56-54 after Garrity hit a jumper with 3:21 remaining, but Weber State scored nine straight points on a basket by Tresnak, a 3-pointer by Jordan Richardson, two free throws from Bamforth and a layup by Otis.
The win sets up a big week for the Wildcats, who face Montana State (3-4 Big Sky) on Thursday before squaring off with Montana (8-0) in a battle for first place next Saturday.
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