The figure was revealed by Windsor's visitor manager Julia White on Tuesday at a meeting of the visitor management forum at Legoland in Windsor.
She said that 264 had undergone training in spectator safety, after putting in long hours at recent events such as the Royal Windsor Horse Show, learning how to look after large crowds.
She said: "They will work in teams of four in four-hour shifts all around the main arrival and departure sites during the games.
"If there are any incidents or delays caused by the weather we need to be able to respond. Our ambassadors in their pink and purple uniforms will be the first thing spectators see when they arrive."
She said that at Slough station there will be an expected seven trains an hour carrying an expected 1,000 visitors on each, for the Olympics.
She said: "They will be greeted by our ambassadors when they arrive and when they go. They will be able to talk to them and suggest places they might want to visit in the surrounding towns."
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.