With a high of 97 on Saturday, by 7pm it will be in the lower 90's, if we are lucky. Too early to know about wind. Besides by that time, most of the field should be in the shade anyway, so it should feel cooler than it would in the sun.
I don't buy accuweather's forecast of 89. Accuweather only cares about getting the forecast right for the east coast, they don't care about the rest of the nation.