Denver's calling for temperatures in the low 40s during the game and a low chance of precipitation. Earlier in the week forcasters were suggesting snow but it doesn't appear that'll be the case today. The wind shouldn't be a huge factor as they're predicting winds under 10 miles an hour.
In other words, the weather is no excuse today. The Chiefs have had a pair of rain games this year (San Diego and Oakland) and their offense hasn't performed great in either so this is good news for KC. The Broncos are a passing team so bad weather wouldn't help them either.
I'm not quite ready for winter but it's coming fast. I came to Denver, and in a nice brain fart moment, didn't pack a winter jacket! Yes, my planning has been better but I audibled to get a jacket. The bits of snow you see on the ground occasionally here in Denver are telling me I better get that jacket out of the closet soon.