Recent National Weather Service and AccuWeather guidance shows a cooling trend into the August 30–September 7 window, driven by an incoming upper-level trough that has ended late-summer ridging and extreme heat across the western U.S. Daytime highs at Black Rock Desert are projected mainly in the low-to-mid 80s °F, consistent with early-September climatology at ~4,000 ft elevation where strong nocturnal radiative cooling and dry adiabatic lapse rates limit extremes. El Niño conditions currently enhance overall warmth but are secondary to the short-term pattern shift. Trader sentiment clusters around 86–88 °F because ensemble spreads remain modest yet allow for modest warm-side outliers if the trough weakens faster than expected or for sub-86 °F outcomes if additional shortwaves reinforce cooler flow; higher bins (91 °F+) reflect residual model uncertainty in boundary-layer mixing and downslope warming.