Forecast consensus from National Weather Service and other models points to a high in the low-to-mid 90s for Dallas on September 30, driven by increasing afternoon cloud cover, 30-40% thunderstorm chances, and southerly winds that limit full solar heating amid rising humidity. Recent model runs show this setup following a mostly sunny 93-95°F day on the 29th, with the approaching moisture and potential storms acting as the key cooling influence that positions 92-95°F ranges as the strongest market-implied outcomes. Heat indices could briefly reach 100-102°F before any rain develops, though timing and intensity of convection introduce modest uncertainty in the exact peak.