Latest National Weather Service and model guidance for San Francisco on August 6, 2026, centers on a daytime high of 70–73°F, with the tight 70-71°F and 72-73°F market bins reflecting residual uncertainty over the strength and timing of marine layer clearing. Persistent onshore flow and coastal stratus have capped temperatures near seasonal norms around 69°F, though any earlier dissipation of the marine layer could allow modest warming into the low 70s without triggering broader heat-wave conditions affecting inland areas. Historical August averages and recent ensemble runs support this narrow range, as stronger sea breezes or delayed clearing would favor the lower bin while lighter winds tilt probabilities slightly higher.