League needs to address this before one of the larger guys has heatstroke. Perhaps have the Dolphins on the road for the opener and night home games in September. Average daily high in Miami is 89 in September, drops to 86 in October. Skew the home schedule towards Late October on.
I think Jacksonville has the same issue in September, but temps drops off more quickly in October. Most of the other hot weather cities are Domes - Atlanta, NO, Houston, Dallas, Arizona, LA.