mthayer,
Although I do enjoy a ride in the warm rain, I believe that it is a practice which reduces my odds of survival to ride another day. If it is raining hard, then drivers of automobiles can not see you on the road, period. No matter how many lights you have on, what colors you display, or how obstinate you may be about demanding your right of way. When on tour my practice is to ride every day until rain is surely predicted for the day and then I take a rest day. Just my choice.
Good luck with your ride.