|Olympic medal record|
|Competitor for Sweden|
|Silver||1924 Paris||4x400 metre relay|
Wejnarth competed for Sweden in the 1924 Summer Olympics held in Paris, France in the 4 x 400 metre relay where he won the silver medal with his team mates Artur Svensson, Erik Byléhn and Nils Engdahl. In the 400 metres event he was eliminated in the quarter-finals.
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