For a similar century (60s and some drizzle/fog) a couple weeks ago, I wore the following:

Wicking cap
Wool short-sleeve jersey
Arm warmers
Wind vest
Knickers (I would have worn shorts and knee warmers if it was going to warm up, or the sun was scheduled to appear)
Lightweight wool socks (Defeet wooleators)

In hindsight, I should have worn lightweight long-fingered gloves because of the moisture and chill in the air. Otherwise, I was perfectly dressed for the conditions and my personal thermostat.

+1 to Oakleaf's rain gear comments. Unless it's dang cold, I don't bother with it. (And if it's that cold and raining, I'm probably on the couch, wrapped in a blanket )