Current National Weather Service and model guidance point to a San Francisco high on August 22 in the mid-to-upper 60s under persistent onshore flow and coastal stratus, with limited afternoon clearing possible. This setup aligns with the seasonal marine-layer regime that caps temperatures near the long-term August average of roughly 69°F while suppressing extreme warmth. Trader emphasis on the 70–73°F brackets reflects the narrow but real upside from any earlier or more pronounced clearing, consistent with recent August variability where daily highs have fluctuated between the mid-60s and low-70s amid fluctuating pressure gradients. Final resolution hinges on the peak reading at official stations before evening marine intrusion, with the next model cycle and midday observations likely to refine the exact outcome.