I played these three courses (pebble then spyglass then Spanish Bay) in October. It was so amazing, you will have a great time.
Clothing: Im an Arizona guy, so for me it was a bit chilly (low 40's high low 60's). Pants weather for sure. I wore an under armor long sleeve under shirt with a regular golf shirt. When it was breezy I had on my pullover light weight jacket, when it was more sunny and calm it was too warm with it on. I teed of early (just before 8 am) each day. Spanish bay was the coolest as the beginning holes were right on the breezy ocean. I wore a beanie for the first 9 holes that day. I was always comfortable, not to chilly for golf.
Pebble was the toughest for me, the greens are very small, and it took about 4 holes before my pulse was below 100bpm. Technically spyglass is more difficult, but it set up better for me. I hit some great shots at spyglass, and generally played better than at pebble, and avoided the trouble for the most part. I had a blast at spanish bay. (the only course I didnt use a caddy, but by the last day I had a pretty good grasp of the poa anua greens.) had three doubles on pebble to go with three birdies shot an 80. Had one birdie on spyglass, also shot 80. Two birdies on spanish bay and shot 75. Usually shoot mid to low 70's at my home course. Greens were running about 9.5-10. Not too fast, but really true. I was playing mostly bermuda at the time (before overseeding) and it was an adjustment. I putted well at pebble, and trusted the caddy, it was a good call. He was right on. We had the same caddy at spyglass. I had better iron play there but didnt putt quite as well as I did at pebble and Spanish bay.