Rain is a sure bet here, in the spring and summer, with the pop up showers and T-storms. Lightning calls it off, or makes me take safe shelter, however, if its just a shower I ride. I would be just as wet from my sweat. I have a Pearl Izumi Pro Lite rain jacket, it is almost a gossamer fabric, and for a shower its fine. It folds up, or can be rolled up, small enough for a jersey pocket. Neoprene shoe covers completes the rain stuff here. No rain pants or wool stuff, yet.

Bill