Forecast models from the National Weather Service indicate San Francisco’s August 12 high will likely settle in the upper 60s to low 70s, with the two leading market bins reflecting modest uncertainty over marine-layer strength and onshore flow. Persistent cool Pacific air and a shallow marine inversion are expected to limit afternoon warming despite seasonal peak sun angles, while any late-day clearing or light offshore breeze could nudge readings a degree or two higher. Historical August normals near 70 °F provide context, yet daily variability from coastal stratus timing keeps the 68–71 °F range tightly contested. Updated model runs and the evening forecast discussion remain the key near-term catalysts.