Trader consensus on the closely matched 74–75°F and 76–77°F brackets for San Francisco’s July 14 high reflects uncertainty in marine-layer evolution and onshore flow strength, per National Weather Service guidance. Typical July climatology favors highs near 70°F when persistent stratus and cool Pacific air dominate, but recent model runs indicate a thinning marine layer could allow partial afternoon clearing and modest warming to the mid-70s. Key variables include wind direction shifts that either reinforce or weaken coastal cooling, plus any residual warmth from inland heat advected westward. Official forecasts from the National Weather Service show Monday–Tuesday peaks near 77°F before a cooldown, highlighting how small changes in cloud timing or breeze can shift the daily maximum across the leading brackets.