Forecasts from the National Weather Service and major models indicate an overnight low near 79°F for Houston on August 30 under mostly clear to partly cloudy skies, light southerly winds, and high humidity that restricts radiative cooling. This supports the tightly clustered market probabilities around 76–81°F. Persistent warm, moist air with dew points near 75°F and minimal advection of cooler air keeps minima elevated above typical late-August climatology of about 75°F. Subtle differences in model runs for wind speed, cloud cover, and dew point depression create the narrow spread among leading outcomes, while the absence of any frontal passage or stronger cooling signals limits support for lower ranges. Updated NWS briefings and model consensus expected overnight will likely refine these probabilities before resolution.