Heavy rain and thunderstorms. Though not quite as severe as they'd expected. Still, it was serious.
20 mph headwind, to boot.
Still, I really didn't mind very much. I recently added a powerful headlight for just this reason. I carry seven pounds of battery to power the thing. (I don't carry the battery on days when I'm sure I won't need it.) I felt very secure.
I got wet. My so-called rain gear is in the dryer right now.
Yet it was still a fine ride, mostly.