Recent National Weather Service forecasts for San Francisco on August 6 point to a daily maximum in the low-to-mid 70s, driven by a persistent marine layer and onshore flow from the cool California Current that limits daytime warming. This positions the 72-73°F outcome as the market leader at 41% implied probability, narrowly ahead of 70-71°F, as traders weigh the exact timing of fog clearance and any strengthening sea breeze against historical August averages near 70°F. Differentiation among close bins hinges on microclimate variations at official reporting sites, model consensus on boundary-layer mixing, and whether light winds allow brief afternoon peaks above 73°F before evening cooling sets in. Updated NWS guidance through the afternoon will refine resolution criteria based on verified observations.