The close market split between 70–71°F (39%) and 72–73°F (36%) stems primarily from uncertainty in marine layer depth and afternoon clearing timing along the San Francisco coast on August 6. Persistent onshore flow and coastal upwelling of cold Pacific waters, reinforced by a typical August marine inversion, are expected to cap daytime highs near the long-term average of 69°F, with National Weather Service guidance showing upper 60s to low 70s under variable stratus. Slight model differences in inversion strength or fog dissipation could allow modest warming into the low 70s at inland or sheltered spots, while stronger marine influence keeps readings at the lower end. Resolution depends on the official maximum from stations such as KSFO, with final observations available after sunset.