Europeansilver for Tweedie
He completed the 750m sea swim and three-mile run in 28.38, finishing a close second to his GB team-mate Samuel Dickinson, who clocked 28:22.
Dylan Magnien of France was third in 28:54.
Tweedie, who is part of the GB Elite Triathlon set-up at Loughborough, led after the swim but Dickinson took over on the run.
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Hide AdThis was the third time Tweedie had represented GB in the event and the second time he had been on the podium. He was also runner-up in 2016.
Paul Jephcott from PACTRAC was selected to represent GB in the Mid-Distance European Championships but was unable to run because of injury. He still travelled to the event though and put the vest on and completed the swim and bike.