Amateur career
Weaver had a successful amateur career and in 2022 he was runner-up at the Sir Henry Cooper Junior Masters and won the English Under-18 Amateur Stroke Play Championship. In 2023, he won the Carris Trophy for the English Boys' Open Amateur Stroke Play Championship, and was runner-up at the English Amateur. Weaver helped England win silver at the 2022 European Boys' Team Championship in Germany, and win bronze at the 2025 European Amateur Team Championship, where he set the Killarney Golf & Fishing Club amateur course record with a 63.
Weaver enrolled at Florida State University in 2024. He went on to earn ACC Freshman of the Year honours thanks to a runner-up finish at the 2024 Seminole Intercollegiate and a season scoring average of 71.71. As a sophomore in 2025, he was runner-up at the ACC Championship and won the Cabo Collegiate, which earned him an invitation to the World Wide Technology Championship on the PGA Tour.
Weaver made his major debut at the 2025 U.S. Open at Oakmont Country Club where he carded rounds of 75 and 74 to narrowly miss the cut. He qualified by finishing tied 3rd in the 84-man field at Piedmont Driving Club in Atlanta, Georgia.
He was a part of the International team which defeated Team USA at the 2025 Arnold Palmer Cup, and helped defeat the U.S. again at the 2026 Walker Cup at Lahinch Golf Club in Ireland.
In 2026, Weaver rose to second in the World Amateur Golf Rankings and number one in Europe just ahead of Luke Poulter and Tim Wiedemeyer, to be crowned European Amateur Golfer of the Year by the EGA.
England