Trader consensus centers on a modest warming trend for July 13 driven by high pressure compressing the marine layer to roughly 500 feet, reducing stratus coverage and allowing greater daytime solar heating along the coast. Onshore northwest flow from the California Current and associated upwelling normally caps highs near 68°F in July, but recent model runs indicate slightly drier mid-level air and a shallower inversion that could permit readings in the mid-to-upper 70s. Small differences among the leading 76–81°F bins hinge on exact burn-off timing, wind speeds, and how far inland warming penetrates before sea breezes reassert. Historical July variability at KSFO shows standard deviations of 4–6°F around the 69–72°F mean, underscoring why traders assign meaningful probability across these narrow ranges while assigning negligible odds above 85°F. Updated NWS and short-range guidance expected through the morning of the 13th will likely refine these boundaries.