I've never had success in a moderate to hard rain, but have had success right after a rain let up. I've also had good hunts in light, drizzling rain, so long as the wind isn't howling. I've had even better luck with pigs on the rainy days, as they seem to let their guard down much more than the deer. I can think of several rainy hunts where I sat in one spot and shot 4-5 hogs over the course of a couple of hours.
