Persistent onshore flow and a shallow marine layer are keeping San Francisco temperatures near or slightly below seasonal norms on August 29, 2026. Official forecasts from the National Weather Service and local models project a daytime high in the mid-to-upper 60s under partly cloudy skies, with west winds of 10–20 mph limiting afternoon warming by advecting cooler Pacific air. The closely matched market probabilities for 66–67°F and 68–69°F reflect uncertainty in marine-layer depth and the exact timing of any stratus thinning, both of which can shift peak readings by a degree or two. Recent August conditions have featured similar suppressed maxima around 65–70°F, consistent with the current setup where stronger pressure gradients reinforce the cool, stable boundary layer.