Outdoorsman,
Rain is a Tonic for the Whitetail Hunter.
Deer tend to be more active just prior to and just after a rain.
During the rain,deer(Whitetails,at least)are less active,but also less cautious. They don't seem to expect any two legged fools to be out in the rain. I am only a moderately effective Hunter,and I have had great success walking up to deer,in the rain.
During the rain,practice your stalking skills,because sitting in the rain can become boreing. As soon as it stops,find a good place to wait.Now,the deer are moving.
good luck,
Frank