Weber was born in
Denver, Colorado to Kurt and Deidre Weber. From an athletic family, Weber's mother Deidre ran High School track. Emma attended
Fairview High School in Boulder, but by her Senior year transferred to
Regis Jesuit, a co-ed Catholic private preparatory school in greater Denver, where she graduated in 2022. Regis Jesuit had a stronger swim program than Fairview, and after her transfer, she was closer to her club team, the Denver Hilltoppers. At Regis Jesuit, she was coached by Nick Frasersmith, who had previously coached Olympic swimmers
Missy Franklin and
Clark Smith. In an interview with The Denver Post, Weber cited Missy Franklin, who had earlier attended Regis Jesuit, as an early-inspiration for her, and often visualized going to the Olympics like her. == University of Virginia==