Forecast models from the National Weather Service and private sources indicate Austin's overnight low on August 28 will likely settle in the mid-to-upper 70s, with consensus pointing to 75–79°F under clear skies and light southeast winds. High dew points near 70°F from persistent Gulf moisture limit radiational cooling, while minimal cloud cover allows some heat loss after sunset. The closely matched market probabilities around 72–77°F reflect genuine uncertainty in exact minimums, which hinge on subtle variations in boundary-layer mixing, urban heat island effects, and precise observation timing at Austin-Bergstrom or downtown stations. No major frontal passages are expected before dawn, keeping trader focus on the narrow range of guidance outputs.