Recent National Weather Service and AccuWeather guidance for San Francisco on August 7 point to a daytime high near 70–73°F, with the market’s tight split between 70–71°F and 72–73°F reflecting model spread on marine-layer behavior. Persistent onshore flow and coastal upwelling maintain cool Pacific waters that limit warming, while the timing and depth of the morning marine layer determine how much solar heating occurs before the sea breeze strengthens. Light west-southwest winds and gradual clearing favor modest afternoon rises into the low 70s, consistent with August climatology centered near 69–70°F. Any deeper fog or stronger pressure gradient could cap the high closer to 68–69°F, whereas reduced stratus and lighter winds would allow readings near 74–75°F. Updated model runs and afternoon observations will clarify the exact threshold ahead of market resolution.