Recent National Weather Service and model guidance indicate San Francisco's August 10 high will likely fall in the low 70s, driven by typical marine layer persistence and onshore flow that moderates coastal temperatures. Trader consensus between the 70-71°F and 72-73°F bins reflects uncertainty in the precise peak, hinging on factors such as the timing and strength of the afternoon sea breeze, degree of morning cloud cover or fog burn-off, and minor variations in upper-level warming. Historical August averages near 69-70°F provide baseline context, with current conditions showing no strong heat advection from inland areas. Updated NWS forecasts and real-time observations on the day will clarify resolution between these closely matched outcomes.