He'll have to wait until Monday morning to get another chance.
Weekley, Camilo Villegas, Mark Wilson and Jose Coceres went into a four-man playoff Sunday night, one that they couldn't finish before darkness fell on PGA National.
Each player made par at the par-5 18th, the first playoff hole. Wilson made a spectacular par, driving his tee shot into the mud and scrambling to the green before making a 30-foot putt to keep him in contention, and Coceres' birdie try that would have ended the tournament hit the lip and rolled away.
Weekley made a 3-footer to earn his trip to the second playoff hole, and Villegas then tapped in from about 2 feet - the final shot before play was suspended.
Villegas and Coceres closed with 4-under 66s, while Weekley and Wilson shot 71s to finish at 5-under 275. Tripp Isenhour (67), Robert Allenby (68) and Steve Stricker (69) followed at 4 under.
Play was scheduled to resume at 8:30 a.m. Monday, with the foursome on the par-4 10th hole, continuing to vie for the $990,000 winner's prize.