Just back to work after my SD hunt. Friday was 75* - way too hot! Saturday - Monday we had periods of light rain. Just a little breeze, a lot calmer than I am used to in past trips. Very good hunting in that type of weather. I would hunt in the light rain any day compared to the heat. Today it's extremely windy and horizontal rain back here in Wisconsin and I suspect it's bad in SD, too. I guess we had good timing.
I'm one that will take more than a little rain to keep me from hunting. I don't mind at all, especially with dry clothes and a warm shower waiting after I'm done for the day.
As someone else mentioned earlier, the birds didn't run as far and held very tightly. It made for some great shooting and good dog work, too. We found a lot of them under plum thickets, so thick neither we or the dogs can sometimes get through, but it's open underneath and the birds can move around.
I have a hunting vest and a jacket. The jacket I treat with spray waterproofing and it's repellent enough to keep me dry unless it rains hard. I also take my goretex and wore the pants on Sunday. I was the only dry one in the bunch thanks to my planning for foul weather. I say observe the conditions, dress accordingly and get out there and hunt!