According to Yahoo Weather, there's a 55% chance of rain Sunday. The forecast high temperature on Sunday is 45 degrees with a low of 35.
It's only supposed to be light rain, according to the Weather Channel, with winds from 10-15 mph. Given that the Chiefs have played two very cold games, including the fourth-coldest game in NFL history in the wild-card round, a little bit of rain with temperatures in the high 30s or low 40s isn't all that bad.