Weale became the first British man to win an individual medal at a European Championships when he won silver at the 2010 competition in Hungary.
His tenth-place finish at the Beijing 2008 Olympics was the best performance by a British man since Graham Brookhouse's eighth in Barcelona 1992, before he recorded a 13th-place finish in London 2012.
A World Cup bronze medallist, Weale also just missed out on a team relay medal at the 2009 World Championships at Crystal Palace when he came fourth partnering Nick Woodbridge.
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And the 31-year-old, who first took up the sport in 2000 and will now concentrate on a teaching career at Dulwich Prep School in London, revealed he would have loved to have had the team medal in his collection.
"I've had a fantastic career," he said. "The men's team is looking absolutely fantastic at the moment and it's nice to see the achievements of the men equalling those of the women.
"One of my biggest regrets is not winning a team medal, but hopefully there are a lot of team medals in the men's team now."
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GB women end winning run in Olympic modern pentathlon competition