Recent National Weather Service forecasts point to a persistent marine layer and moderate onshore flow limiting San Francisco's July 5 high to the mid-to-upper 60s, supporting the market's leading 68-69°F bin at 25% implied probability. Variable fog depth, cloud timing, and local wind shifts create substantial uncertainty, spreading probability across multiple 2°F brackets and reflecting typical summer microclimate variability along the immediate coast. Historical July averages near 70°F provide context, yet current model consensus favors cooler conditions than inland areas. Updated short-range guidance and afternoon observations from official stations will likely drive any late shifts in trader positioning before resolution.