Quote Originally Posted by Muirenn View Post
If it's going to be very wet, you may consider a tire that can ride more safely in those conditions. It is flat, but you still need traction. (Perhaps Continental 4 Season). You could even try the 25 mm.
Or less air pressure in your regular tires, for better traction.

I agree that waterproof jackets can make you too warm but I've done a couple of rides where I got soaked in the rain and then was very cold for the rest of the ride because my clothes were wet. Riding in the rain in the 70s is cooler than riding in the sun in the 70s.