If you get the kind of rain you're hoping for, it could move the dirt and seed around a little bit. Then again, it's the weather - you never really know. I'll usually roll the dice, but I've also had my share of do-overs. Sometimes that ideal stretch of weather is hard to come by, and sometimes it happens when it's not expected. Like if you got 1" total of rain next week, that would be great for germination. It makes it interesting.