Much colder air is going to move through southern Lower Michigan Saturday. The big drop in temperatures may occur at East Lansing in the second half of the big game.
Along with the temperature drop will come some wet weather. I wouldn't call it a solid, steady rain at all. It will be more of a spurts of rain situation. By the end of the game there could be wet snow mixing in with any rain shower.
A stiff northwest wind will be a big factor for your comfort in the stadium, and could be strong enough to affect play, especially the kicking game.