I hunt every chance I get. If it' s going to downright windy and pouring all day, then forget about it. But, if it' s just a steady rain or drizzle, I' m going. Here' s how I prepare:
1. Extra change of clothes
2. My handy tree umbrella which has kept me dry numerous times in rain, sleet and snow.
3. Make sure I have bow wax on my strings.
4. At end of day I make sure I dry my bow and all very well. I sometimes use my air compressor in the garage to blow out all the nooks and crannies.

I actually look forward to hunting in the rain because it' s more peaceful, quieter getting into the woods on foot (especially when there are lots of leaves down) and I find that 85% of the other hunters stay home so the woods are all mine!