Latest National Weather Service and model guidance point to a modest warming trend for San Francisco on July 30, with highs potentially reaching the low-to-mid 70s if onshore flow weakens and the marine layer thins. Persistent coastal upwelling and typical July fog patterns, however, favor suppression near 70°F or below at KSFO, aligning with trader emphasis on the 68–71°F bins. Recent observations from the prior week show highs stuck in the upper 60s amid strong onshore winds, and ensemble spreads remain wide due to variable stratus timing. This genuine forecast uncertainty—centered on boundary-layer moisture and wind shifts—explains the close clustering around 70–71°F as the modal outcome while capping odds on 74°F-plus scenarios.