**Current forecasts from the National Weather Service and private models point to a Labor Day high near 74–77°F in downtown San Francisco, consistent with the market’s tight clustering around the 76–79°F bins.** Onshore westerly flow and the marine layer are expected to moderate temperatures, keeping the city cooler than inland areas despite seasonal warming trends. Recent early-September observations show daily highs of 68–71°F under persistent onshore winds and morning fog, establishing a baseline slightly below the 1991–2020 average of 70.3°F. Differentiation among the leading outcomes hinges on subtle variations in marine-layer depth and afternoon clearing timing: stronger onshore flow or delayed fog burn-off favors the 76–77°F range, while a modest weakening of the onshore gradient could push readings into the upper 70s. Model consensus remains stable with no major heat-wave signals, though traders are assigning modest probability to 80°F-plus outcomes if offshore influences briefly strengthen. The next NWS forecast updates and high-resolution model runs will likely refine these probabilities ahead of the Monday resolution window.