Looking ahead at the forecast from the Weather Channel for Denver on Tuesday 9/17 and Wednesday 9/18.
Tuesday 9/17: High 87, Low 57 with a 10% chance of precipitation.
Wednesday 9/18: High 85, Low 57 with a 0% chance of precipitation.
Considering the altitude and the that it's September, not bad at all. Shorts weather by day, but jacket by night.
As for the days we pass through Chicago... On Monday 9/16, a high of 75, low of 65 with 10% chance of rain. On Thursday 9/19, high of 81, low of 68, and 20% chance of rain.
Things always subject to change, so we'll see if the above holds true.