Hi,
It depends what part of September and October.
Early September is just like August....hot and relentlessly humid with frequent afternoon thunderstorms. Highs average in the low 90s with mornings in the 70s. Afternoon average highs stay near 90 all month. By the end of October, the average high is in the low 80s with mornings in the 60s, although there is more variance by late October, meaning you could still have days in the 90s but you could also have days in the upper 60s-mid 70s.
Bob