Current forecast models from the National Weather Service and ensemble runs indicate San Francisco highs on July 15 will likely settle in the 70–73°F range, reflecting the dominant influence of the cool California Current and a moderate marine layer that limits daytime warming through fog, stratus, and onshore flow. These conditions typically cap temperatures near seasonal normals of 67–72°F, with slight upward pressure possible if high pressure weakens the layer and allows more solar heating or reduced wind. Lower outcomes would require stronger onshore advection or deeper fog, while rarer spikes above 74°F hinge on offshore flow or clear-sky subsidence—scenarios models currently assign low probability. Traders weigh these atmospheric dynamics against historical July variability at KSFO, where the marine environment keeps extremes infrequent.