I measured the temp of the water in my water bottle when I got home yesterday at 4pm and it was 117F. I used a calibrated thermometer. Despite the warmth of the water it was better than none for the last few miles home. It started at 32F packed with ice cubes when I left work.

The high temp was only 115F, but I suspect the water gets hotter from sun and the heat radiating from the 167F pavement.