The judge sentencing Ashley Gill-Webb said although his behaviour was "serious" enough to demand punishment, he thought Gill-Webb was unlikely to offend again.
Gill-Webb was found guilty of intending to cause the men's Olympic 100m finalists harassment, alarm or distress by using threatening, abusive or disorderly behaviour.
Prosecutor Helen Shaw said the high-profile nature of the incident and the fact that the world was watching were aggravating factors.
[It was a] once-in-a-four-year event watched by millions of people around the world.
Some of the people who were in that area missed the event and had paid up to £4,000 a ticket.
More top news
Scientists believe 400,000 cases of womb cancer have been avoided over the last 50 years by women taking the contraceptive pill.
Tony Blair could be made to stand trial for war crimes over the invasion of Iraq, Labour leadership frontrunner Jeremy Corbyn has said.
The number of fines handed out to hauliers found carrying illegal immigrants into the UK has more than tripled in the last three years.