Current NOAA and regional model consensus points to a San Francisco high near 70–72 °F on August 11, reflecting the dominant Pacific marine layer and prevailing westerly flow that typically caps afternoon warming along the coast. Climatological averages place the August daily high at about 69–70 °F, with rare excursions above 75 °F when onshore winds weaken or subsidence strengthens. Slight differences between leading 70–71 °F and 72–73 °F bins stem from ensemble spread in boundary-layer mixing and fog clearance timing; any delayed marine intrusion or brief clear-sky heating could nudge readings higher, while persistent stratus would favor the lower range. Traders are weighting the latest NWS guidance and model runs that resolve these variables before the daily maximum is recorded at official stations.