October tends to be a dynamic weather month here. (Much like March.) You'll have days where it's quite warm and humid. In the upper 80's with a feels-like of a little more. Then, other days, you'll have a nice, cool, what-passes-for-Autumn-in-Florida days where it stays in the mid/upper 70's and cooler at nights. Those kinds of days are far less humid and the feels-like temp is closer to the actual temperature.
Towards the end of October things tend to be more cool then warm though it's up for grabs the beginning and middle of the month. Keep and eye on the forecast right before you leave but you might want to pack for both conditions just in case. (Because it can be cool one day and then humid the next.)
Either way, don't forget your sunscreen! Cool days or not, our UV Index is always much, much higher then other parts of the country, so it's easy to burn - especially on deceivingly cool or overcast days! (The curse of being the only sub-tropical state in the union.)
Have fun!
-m
