Short-term forecast models indicate substantial uncertainty for San Francisco's high temperature on September 14, with market-implied odds spread across the 70-77°F range reflecting divergent National Weather Service guidance. Key variables include the depth and persistence of the marine layer, onshore flow strength, and any strengthening of a weak offshore high-pressure ridge that could limit cooling. Coastal locations often see suppressed maxima when fog or stratus lingers into the afternoon, while clearer conditions allow readings several degrees higher. Historical September baselines near 70-75°F underscore the typical variability driven by sea breezes. Updated model runs and local observations over the next 48 hours will likely refine these probabilities ahead of resolution.