First if you use a glove make sure you have several... Then make sure you have more then one towel.. Keep one maybe 2 extras in a large zip lock bag to keep them dry..

Those are your prep tips. WHen playing in the rain remember one thing. The more your feet sink into the ground the more likly you will hit the ball fat. I like to narrow my stance just a bit to ensure I don't hit to many heavy iron shots.. Remeber to take a little more club today also. The air is thick and the greens are going to be soft.

Thats how I play in the rain. I don't use a golf glove but I do all the other stuff.