Damnit, I've been enjoying my anonymity here for ages and now I finally feel compelled to break my streak.
Two weeks, 3,000 miles, up and down the coast. I've done this...more times than I care to admit on too many bikes. It's a fantastic ride, no doubt.
Summer or Winter, the roads will tend to be cold, damp and dirty with the first two especially common in the morning and evening. Rain gear is a must whether it's raining or not. It's common to have June-Gloom fog and mist through 10am along the coast. It's also possible to have temps in the high 40's, though upper 50's in the early AM is more common.
Leather is fine as long as you have the rain gear. You never when you will just plain get caught in it. Electrics are a great option - definitely extending the riding and adding huge comfort. If you don't have an e-vest, consider smartwool thermals, tops and bottoms. It never ceases to amaze me how much heat is lost through the legs...and the Monster doesn't hardly put out enough heat to make much of a difference.
On a budget I'd go hit CycleGear like, right now, for their Freeze-Out stuff. It's cheap, on sale and actually works.
Consider a neck-gator, bandana, balaclava or some such. Very handy in the cold and just as handy in the heat to keep the hot air off the neck. I pretty much wear a neck buff year round.
My touring gear typically is as follows:
Dainese Leathers (*or Aerostich Roadcrafter)
Waterproof Rain Gear
Riding boots (gore-tex)
Two sets of gloves (one waterproof set)
In the tail bag I'll add my e-Vest, Smartwool thermals, a light fleece shirt (thin, extra warmth layer) and, of course, whatever change of clothes I want. Typically that's just a Target running shirt/pant combo and a couple changes of underwear (synthetic) and socks. I don't bother with extra shoes anymore, just a pair of flip-flops.
Oh, make sure you have a flat-repair kit and know how to use it. I've plugged many a tire on the road - many of which weren't my own.
Don't worry so much about riding in the rain. It's quite nice actually. Just slow it down and be easy on the controls and watch the white-lines in the road. I do an annual Monterey Ride that's become known as "Monterey Madness" in December. We typically get rained on in a big way. One year was 750 straight miles of downpour. That rocked in soo many ways.
Above all, DO NOT SPEED on PCH! It's heavily patrolled and the LEO's are merciless.
Oh, other thoughts: Nacimiento-Fegussen is a fantastic road. The ride through Fort Hunter-Leggit is spectacular in NorCal, especially coming from inland and dropping down to PCH. Incredible overlooks. If you get to the Eureka-Fortuna area in NorCal, ask around for the "Lost Coast Loop". It's a truly undeveloped segment of PCH and worth the find. The Loop takes you through the Redwoods...
Oh, and when you cross from Cali into Oregon the speedlimit drops from 65 to 55 and there's a cop on the Oregon side waiting to nail you.
Above all else, enjoy the moment and have fun!
(*Ok, back to being a lurker...)
Yes, you can in fact tour on anything.
That was 2300 miles in four days...