In years past, El Tour riders have faced high wind, cold, heat and rain. This year, other than a 15mph-or-so wind, the weather should provide neither a hindrance or help for cyclists. Morning lows will be in the 50s with afternoon highs in the upper 70s.
The following images, with captions, will walk you through the morning's weather at different locations along the route.

Figure 1: The perimeter map.

Figure 2: Weather at the starting point.

Figure 3: Weather at the southwest corner of the perimeter.

Figure 4: Weather at the southeast corner of the perimeter.

Figure 5: Weather at the northeast corner of the perimeter.

Figure 6: Weather at the Oro Valley sector.

Figure 7: Weather at the finish line.