Persistent marine layer stratus and onshore westerly flow from the Pacific are anchoring trader expectations for a San Francisco high near 68–72 °F on August 24. Official guidance from the National Weather Service and model consensus show morning low clouds or fog giving way to partial afternoon clearing under a modest thermal gradient, limiting surface heating to seasonal norms around 69 °F. Stronger pressure gradients and deeper marine-layer depth would favor the 68–69 °F bin by enhancing advection of cooler air, while any thinning of the stratus or slight offshore component could push readings into the 70–71 °F or low-70s range. With the event less than 24 hours away, the narrow spread among leading outcomes reflects uncertainty in exact cloud-break timing and boundary-layer mixing rather than large-scale pattern shifts.