Check the archives at Wunderground.
You can plug in last years dates and get graphs of any period. I did that for the Channel Islands. From what I understand you biggest concern is the Santana winds that blow that time of year. I have heard that the evacuate the harbor under those conditions. We were over a couple of years ago in October and had some great weather.
Here is a link to Wunderground with weather graph of October, 2007.
http://www.wunderground.com/MAR/buoy/2007/10/27/46025.html?graphtype=1
Here is the forecast for this week, just thought you'd like to bookmark the site. The weather buoy I always check out it 46025
http://www.wunderground.com/MAR/PZ/655.html
Frank