Generally I would say no rain would be a good thing for the Kansas City Chiefs but against the San Diego Chargers I think rain could be an advantage because it could limit the passing game which is the strength of the Chargers.
It doesn't look like we're going to see rain for Monday Night Football this evening -- at least not in the first three quarters.
The game starts at 9:15 p.m. (Arrowhead time) so it should end around 12:30 a.m. the following day. If that's the case, we could be seeing some fourth quarter rain.
If the Chiefs can establish a lead through the first three quarters, I think that rain could turn out to be a major advantage. On the flip side, I wouldn't want to see the Chiefs trying to make a fourth quarter come back in the rain.