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
Freezing, frosty and icy again tonight as temperatures fall.
Fashion giant Michael Kors Holdings announces that it is phasing out real fur over the next year.
The little boy cried for help but began making the two-mile journey home on his own when there was no response.