Officially, hurricane season is from May through to the end of November, so really a hurricane is possible at any time in this period. Traditionally, September is a 'peak' month, but no-one knows where or when they will hit. There are always predictions, but these are often wrong in the long term.
It's usually coastal areas that are worst hit, so if your friend is in Orlando, it is often bad weather as opposed to dangerous weather. Sorry that's not much help!