Well hi & welcome to the boards!!
October tends to be a bit drier though you can never predict when Mother Nature will decide to rain on your parade.
The wonderful $0.99 camping ponchos from Target, Wal-Mart, K-Mart or even a dollar store are a great investment. Small enough to throw in your bag & go.
If you need them, great. Plus at the price, if they rip or tear (and they will tear rather easily) you can simply throw them away. Especially since you will NEVER be able to fold them that small EVER AGAIN!