National Weather Service guidance and ensemble models indicate Miami will see a mostly sunny morning with easterly flow transitioning to scattered afternoon thunderstorms driven by a weak TUTT feature enhancing instability and lift. Highs are projected in the upper 80s to low 90s, with heat indices near 106°F amid dew points around 78–81°F. The narrow spread between the leading 88–89°F and 90–91°F bins reflects uncertainty in storm timing and coverage: earlier or more widespread convection could cap temperatures through shading and evaporative cooling, while delayed or isolated activity would permit greater surface heating. Light easterly winds of 5–10 mph and typical late-August sea-breeze interactions add modest variability to peak readings. Traders appear to weigh these short-term model shifts heavily given the market’s proximity to resolution.