Next weekend I'm headed down to Auburn for the Western States training runs. Chance to run 70 miles of the course over 3 days. For day one part of the description goes like this, "This section will acquaint you with the canyons and the two most difficult climbs of the entire Run (Devil’s Thumb and Michigan Bluff). Depending on the weather, the run may also help acquaint you with the heat you are likely to experience in the canyons on Race Day."
I checked the weather for next week yesterday.
33C, 35C and 36C.
That statement above may be more applicable than I first thought.