As with NY, I would not have even started, given the forecast. You are lucky, Wahine.
I had hypothermia from getting caught in a downpour when it was about 60 out and I only had a wind jacket, not a rain jacket. I didn't stop shaking for about 3 hours after I finished the ride, even after stripping off the wet clothes in the car, wrapping myself in a towel with the heat blasting, taking a hot shower, drinking tea, and sitting in front of a fire. This was about ten years ago, and I still remember the feeling quite clearly.