It's not much fun to be sopping wet on your bike and still have 100 miles or so to ride.
The best thing to do is to not get wet in the first place. Here's how.
1. Suit up. Every motorcyclist should have a good set of rain gear, either a waterproof jacket and pants or a one-piece suit. There are a variety of waterproof jackets and pants available, including those with a Cordura outer shell, or nylon. Another option is a mesh jacket with a removable waterproof liner that would be great for those hot summer rides.
2. Keep the dogs dry. Another key to staying comfortable in the wet is to keep your feet dry. That best way to do that is with waterproof boots. When you're looking at boots, make sure they're waterproof and not water resistant. If you can't afford to get a pair of waterproof boots right now, or you just really like your old, faithful boots that aren't waterproof, consider getting a pair of waterproof, breathable socks.
3. Hand protection. Keeping your hands warm and dry is critical not only for comfort but for manipulating your bike's controls. Like boots, look for waterproof rather than water resistant gloves. You can get gloves made of leather and a textile material with a waterproof liner.
4. Faceshield squeegee. No matter how dry and cozy you stay on your bike when it's raining, it doesn't do you any good if you can't see. That's why a rider needs something like the Aerostich VeeWipe Squeegee, a thumb-mounted faceshield squeegee ($16). You can get a quick clear look at the road ahead with this little item. (www.aerostich.com)