Get a shower cap and put it over your helmet (assuming its not too hot out) to keep your head dry. Those saran wrap bowl covers also work well for this: Get the mixing bowl size. Use full coverage fenders to keep the spray off of you and your bike, shoe covers and rain gear and you are good to go. Oh, and if you don't already have them, get some lights (red blinkies & white front light) so the cagers can see you.