For those attending the game you might want to be prepared to get a little wet. I personally don't think it'll be anything major, but it never hurts to grab a poncho or something.
Cloudy with a few showers. High 64F. Winds W at 5 to 10 mph. Chance of rain 30%.
Link to weather
I also can't remember the last time it rained at a Niner game. It must be years since it has. For some reason I remember sitting in the pouring rain and getting our butts kicked by Green Bay on Monday Night, or something.