Recent forecasts from multiple sources, including National Weather Service-aligned models, indicate San Francisco’s September 13 high will likely reach the upper 60s to low 70s under clear skies and moderate west-northwest winds of 10–20 mph with gusts to 30 mph. Onshore marine flow and the typical September marine layer keep temperatures near the long-term average high of 70.8°F, limiting afternoon warming despite abundant sunshine. Current observations show morning readings in the upper 50s rising steadily toward 68–70°F by midday, consistent with the market’s heavy weighting on the 68–71°F bins. No significant warm advection or offshore flow has emerged to push readings higher, supporting the 52% implied probability on 70–71°F as the consensus outcome. Updated model runs and afternoon observations will determine final resolution.