Recent National Weather Service and model guidance for San Francisco points to a June 27 high near 64°F under persistent marine layer stratus and onshore flow from the cool California Current, keeping readings in the low-to-mid 60s consistent with late-June climatology. Trader consensus clusters tightly on 62–67°F because small differences in afternoon cloud clearance timing, wind strength, and boundary-layer mixing can shift the peak by a degree or two without a broader pattern change. Stronger marine influence or delayed clearing favors the 62–63°F bin, while partial sun and lighter winds support the 66–67°F outcome; absent signals of an inland heat ridge or offshore flow, probabilities remain anchored near historical baselines rather than extremes.