First of all, good luck Monday. If your "weather guy" is like ours, you have a 50/50 chance of a dry day. My first turkey was shot on rainy day and I was able to call him from a field into the edge of the woods. Since then, I've used that same strategy many times.
If it's really pouring down, I'd just set up in an edge looking out on to a field or open area. I've done that and had birds circle in behind me, so it's a good idea to be as alert as possible and pick out some shooting lanes on several sides.
Whatever the weather, I always remember that I just can't shoot one if I'm not there. Good luck and please let us know how it goes.
"If he's out of range, it just means that he has another day and so do you."