Trader consensus clusters around 70-73°F for San Francisco’s August 10 high because National Weather Service guidance and ensemble models indicate a typical late-summer marine-layer regime with onshore westerly flow holding daytime maxima near seasonal norms of 69-72°F. Recent model runs show modest warming potential if afternoon clearing occurs earlier than expected, supporting the slim edge for 72-73°F, while persistent stratus or stronger sea breezes favor the 70-71°F bin. Forecasters note that small shifts in wind speed, fog dissipation timing, or mesoscale temperature gradients can easily swing the official high by 1-2°F, explaining why no single bin exceeds one-third probability and why outcomes outside 68-75°F remain low-probability tails.